Unconfirmed:
Im Twelve
Eon Nocturne
SGGaming
Public Display of Agression

------------------------------------------------------------
-------------------- Sea of Sorrows --------------------
------------------------------------------------------------
Players: (53)
Deimos Tel`Arin (Deimos Tel Arin.7391)
cressalve (cressalve.5241) & bro akamrie.8652 (2 people total)
M1X (digitalifeless.1528)
ShikimoriAki (ShikimoriAki.1390)
moodswingfella (Munky.8419)
DrLaboo (DrLaboo.7520)
azizul1975 (azizul.8469)
chiangeg (gene.3581)
ShinRyu (eXoZim.4759)
Desert Punk
yijinchua (BronzeP.8405)
chaos86 and friends (currently 25 players registered) -HAX
Cheesenium (Cheesenium.8126)
-kytz- (Kirchos.7193)
liwei92 (jazx.7319)
Kissan (Kissan.3502)
famd (famd.5941)
ZeratoS (Alexandriea.2901)
dxlethal86 (DxMw.8627)
Miurra (Miurra.1875)
UrHeadMaster (Opa.6307) & family (3 people total)
Jabberwocky (Alexander.4289)
shojikun (shojikareza.1402)
Savor_Savvy (savorsavvy.2784)
gbwedward
dezz (Dezz.4691)
EvanSoon (Hardon.8934)
idz90 (Kilat.9037)
akiawayne (akiawayne.7091)
TheHarryPontek (if possible since no 3days head start, physical box set)
KenshinXt (Iris.3104)
blitzy (MFK.6157)
]{raGeN: (MeerKat.3792) -RavenWolf
frankiethan (frankiethan.6308)
animechuu (Tsukinari.3765)
malice203 (feedrs.9751)
Vendetthiel (zagaara.6724)
takkicom (Dragonborn.1507)
The Amateur Working Bee (Azriel.9237)
bansai (bansai.5643)
bontotalan & friend (Garundia.9483 [me] & pandamerah.2948 [my fren]) -LYN
Jasie & bro (jasie.6217 & FornZ.7251)
hakbu (Brigz.2986)
ben3003 & 4 friends
erni3 (ErnieVoltz.8504)
sora_world07 (Aliffz.8091)
nymerine (merru.3617)

Guilds:
Lowyat.net
Celestial Order
Hollow Ataraxia [HAX] unofficial guild name
League of Legitimate Businessmen
RavenWolf

------------------------------------------------------------
-------------------- Crystal Desert --------------------
------------------------------------------------------------
Players: (28)
eiensakura (seraphica.7093) -AGGR
valho (valho.3859)
Desert Punk (if cannot get in Sea of Sorrows)
claptrap (CapMonkey.3672) -EsF
mistabean.5408 (mistabean) -AGGR
Shray. (SimBa) -AGGR
Cyberkaki.7591 (tatyinw) -AGGR
Kromickon (Kromickon.9746) -AGGR
JYap92 (JonYap.2536) -AGGR
]{raGeN: MeerKat.3792 (if sea of sorrows is full)
sai86 (Lifeless Lust.3820) -AGGR
cressalve (cressalve.5241) & bro akamrie.8652 (alternate server)
bansai (bansai.5643) (if sea of sorrows is full)
8Phantomz (EightPhantomz.6704) -AGGR
Aeneas DT (AeneasDT.2317) -AGGR
Beth (Beth.3864) -AGGR
Don Frank (DonFrank.5198) -AGGR
mrcspng (Okami.4579) -AGGR
newlich (Teng.7312) -AGGR
Nitrolancer (nitrolancer.8196) -AGGR
phanta (phantasm.9468) -AGGR
SirNSC (SirNSCx.8073) -AGGR
Souless ZeN (SoulesSZeN.8174) -AGGR
tempted (imjackson.5148) -AGGR
tshin810 (FrostBike.2685) -AGGR
xennfrosty (xenn.1420) -AGGR
tshin810 (FrostBike.2685) -AGGR

Guilds:
Aggroculture [AGGR] (SEA/Oceanic) (98members) (Synergy Alliance)
Einsof Gaming [EsF] (SEA/SG/Oceanic) (180+) (in discussion of joining Synergy)
TeamOneSG
RavenWolf (if sea of sorrows is full)

------------------------------------------------------------
-------------------- Isle of Janthir --------------------
------------------------------------------------------------
Players: (9)
ArmRule
spacelion (declan.3967)
Cheesenium (Cheesenium.8126) (if cannot get inside Sea of Sorrows)
athlonmax (Maxtross#1258) (Lanun of Isle of Janthir)
-kytz- (Kirchos.7193) (if cannot get inside Sea of Sorrows)
Lelouch
mcblade
idz90 (Kilat.9037) (if cannot get inside Sea of Sorrows)
mengdez (mengdexs.1542)

Guilds:
Lanun of Isle of Janthir (about 13 players)

------------------------------------------------------------
-------------------- Gate of Madness --------------------
------------------------------------------------------------
Players: (1)
shaff (Shaff.8964)

Guilds:
Synapse (titan alliance)
Yakisoba (titan alliance)
Exitializ (pnoy alliance)
Noblesse Oblige

------------------------------------------------------------
-------------------- Ehmry Bay --------------------
------------------------------------------------------------
Players: (0)
xxx

Guilds:
xxx

------------------------------------------------------------
-------------------- Sorrow's Furnace --------------------
------------------------------------------------------------
Players: (1)
xadie of [SWAG]

Guilds:
Socially Wronged Asian Gamers [SWAG] - At the moment composed of Pinoys - 40+
Pro Baddies[Bad] - Indonesian Guild - 80+

------------------------------------------------------------
-------------------- Blackgate --------------------
------------------------------------------------------------
Players: (0)
xxx

Guilds:
Temasek Knights

------------------------------------------------------------
-------------------- Sanctum of Rall --------------------
------------------------------------------------------------
Players: (3)
Cheesenium (Cheesenium.8126) (if cannot get inside Sea of Sorrows or Isle of Janthir)
bontotalan & friend (Garundia.9483 [me] & pandamerah.2948 [my fren]) (if cannot get inside Sea of Sorrows)

Guilds:
xxx

------------------------------------------------------------
-------------------- Dark Haven --------------------
------------------------------------------------------------
Players: (1)
DCboii (DeCree.5698) of Guild Not Another Gaming Acronym[NAGA] (about 18 people)

Guilds:
Guild Not Another Gaming Acronym[NAGA]

Listing all changes, to start things off these are two things I noticed already:
Black Lion Chests have new icons
The in / out of range indicators have been changed (red bar or circle = out of range)
\Chain skills are all shown on skillbar when you hover over it, as are stealth skills when playing thief.
All food now gives an xp buff.

Mesmer changes:
Scepter Ether Clone (3rd hit): increased from a .6 multiplier to a .75 multiplier
Scepter Illusionary Counter: counter effect damage multiplier increased from 1 to 2.
Greatsword Bouncing Blade: now applies 3 stacks of might when it hits an ally;
increased might duration from 5 seconds to 10; increased damage multilier from .9 to 1.3
Greatsword Mind Stab: increased vulnerability duration from 6 seconds to 10 seconds; Mind Stab can now hit multiple targets.
Staff Illusionary Warlock: reduced his cooldown from 4 seconds to 2 seconds; increased the damage multiplier from .4 to .6
Staff Chaos Armor: Now always applies protection for 5 seconds when applied, and now applies swiftness randomly when hit instead of protection.
Staff Chaos Storm: decreased the recharge from 40 seconds to 30 seconds.
Necromancer minions have an option to auto attack enemies and the AI has improved
If bound, Mouse 4 and Mouse 5 etc. now show as M4 and M5 instead of "..."
if your individual keybinds where modified (e.g. shift+1) it now shows both, modifier and key whereas last stresstest it only showed "..."
Tooltip for how to make an ability autocast.
Your mouse pointer is now red when hovering over enemies
You can link merchant items in chat
Water drops on your screen after getting out of water are back!
you can now hit F after looting to loot all
stability from Death Shroud is now 3 seconds
You can change skin colour in the first page of character select
Waypoints that are on your map but not unlocked will show up bigger when zooming out.
If an ability has more then 1 step/phase the tooltips of all those steps and phases are shown
Orb of power work once again.
They removed the forced "downed state" from the starting boss encounter
Illusions shatter much faster.
Walk is now a toggle
You now have an option to get gems via "redeem code" in the store.
Cannons in The Mists are broken.
A new vista has been added to Lion's Arch (near the Arenanet Logo)
Icons of capturepoints in sPvP have been changed to be seen much better from distance on the screen. They are now less transparent.
Engineer shield seems to work now. (the knockback)
The 3rd hit on spirit hammer now causes a knock back similar to smite instead of a knock down.
Signets now tell you the exact value of their passive stats.
necromancer main hand dagger skills do more damage and drain more life.
necromancer death shroud number 2 ability now adds a 3 stack bleed to the target
Mystic Coins can no longer be sold to a merchant
Gathering tools are now available as rewards in personal story
list of trait, achievement and recipice updates
Character creation now kicks you from the server.

Unconfirmed:
Im Twelve
Eon Nocturne
SGGaming
Public Display of Agression

------------------------------------------------------------
-------------------- Sea of Sorrows --------------------
------------------------------------------------------------
Players: (55)
Deimos Tel`Arin (Deimos Tel Arin.7391)
cressalve (cressalve.5241) & bro akamrie.8652 (2 people total)
M1X (digitalifeless.1528)
ShikimoriAki (ShikimoriAki.1390)
moodswingfella (Munky.8419)
DrLaboo (DrLaboo.7520)
azizul1975 (azizul.8469)
chiangeg (gene.3581)
ShinRyu (eXoZim.4759)
Desert Punk
yijinchua (BronzeP.8405)
chaos86 and friends (currently 25 players registered) -HAX
Cheesenium (Cheesenium.8126)
-kytz- (Kirchos.7193)
liwei92 (jazx.7319)
Kissan (Kissan.3502)
famd (famd.5941)
ZeratoS (Alexandriea.2901)
dxlethal86 (DxMw.8627)
Miurra (Miurra.1875)
UrHeadMaster (Opa.6307) & family (3 people total)
Jabberwocky (Alexander.4289)
shojikun (shojikareza.1402)
Savor_Savvy (savorsavvy.2784)
gbwedward
dezz (Dezz.4691)
EvanSoon (Hardon.8934)
idz90 (Kilat.9037)
akiawayne (akiawayne.7091)
TheHarryPontek (if possible since no 3days head start, physical box set)
KenshinXt (Iris.3104)
blitzy (MFK.6157)
]{raGeN: (MeerKat.3792) -RavenWolf
frankiethan (frankiethan.6308)
animechuu (Tsukinari.3765)
malice203 (feedrs.9751)
Vendetthiel (zagaara.6724)
takkicom (Dragonborn.1507)
The Amateur Working Bee (Azriel.9237)
bansai (bansai.5643)
bontotalan & friend (Garundia.9483 [me] & pandamerah.2948 [my fren]) -LYN
Jasie & bro (jasie.6217 & FornZ.7251)
hakbu (Brigz.2986)
ben3003 & 4 friends
erni3 (ErnieVoltz.8504)
sora_world07 (Aliffz.8091)
nymerine (merru.3617)
udin901 (juztdino.2390)
trevorrayne (trevorrayne.1534)

Guilds:
Lowyat.net
Celestial Order
Hollow Ataraxia [HAX] unofficial guild name
League of Legitimate Businessmen
RavenWolf

------------------------------------------------------------
-------------------- Crystal Desert --------------------
------------------------------------------------------------
Players: (27)
eiensakura (seraphica.7093) -AGGR
valho (valho.3859)
Desert Punk (if cannot get in Sea of Sorrows)
claptrap (CapMonkey.3672) -EsF
mistabean.5408 (mistabean) -AGGR
Shray. (SimBa) -AGGR
Cyberkaki.7591 (tatyinw) -AGGR
Kromickon (Kromickon.9746) -AGGR
JYap92 (JonYap.2536) -AGGR
]{raGeN: MeerKat.3792 (if sea of sorrows is full)
sai86 (Lifeless Lust.3820) -AGGR
cressalve (cressalve.5241) & bro akamrie.8652 (alternate server)
bansai (bansai.5643) (if sea of sorrows is full)
8Phantomz (EightPhantomz.6704) -AGGR
Aeneas DT (AeneasDT.2317) -AGGR
Beth (Beth.3864) -AGGR
Don Frank (DonFrank.5198) -AGGR
mrcspng (Okami.4579) -AGGR
newlich (Teng.7312) -AGGR
Nitrolancer (nitrolancer.8196) -AGGR
phanta (phantasm.9468) -AGGR
SirNSC (SirNSCx.8073) -AGGR
Souless ZeN (SoulesSZeN.8174) -AGGR
tempted (imjackson.5148) -AGGR
tshin810 (FrostBike.2685) -AGGR
xennfrosty (xenn.1420) -AGGR

Guilds:
Aggroculture [AGGR] (SEA/Oceanic) (98members) (Synergy Alliance)
Einsof Gaming [EsF] (SEA/SG/Oceanic) (180+) (in discussion of joining Synergy)
TeamOneSG
RavenWolf (if sea of sorrows is full)

------------------------------------------------------------
-------------------- Isle of Janthir --------------------
------------------------------------------------------------
Players: (9)
ArmRule
spacelion (declan.3967)
Cheesenium (Cheesenium.8126) (if cannot get inside Sea of Sorrows)
athlonmax (Maxtross#1258) (Lanun of Isle of Janthir)
-kytz- (Kirchos.7193) (if cannot get inside Sea of Sorrows)
Lelouch
mcblade
idz90 (Kilat.9037) (if cannot get inside Sea of Sorrows)
mengdez (mengdexs.1542)

Guilds:
Lanun of Isle of Janthir (about 13 players)

------------------------------------------------------------
-------------------- Gate of Madness --------------------
------------------------------------------------------------
Players: (1)
shaff (Shaff.8964)

Guilds:
Synapse (titan alliance)
Yakisoba (titan alliance)
Exitializ (pnoy alliance)
Noblesse Oblige

------------------------------------------------------------
-------------------- Ehmry Bay --------------------
------------------------------------------------------------
Players: (0)
xxx

Guilds:
xxx

------------------------------------------------------------
-------------------- Sorrow's Furnace --------------------
------------------------------------------------------------
Players: (1)
xadie of [SWAG]

Guilds:
Socially Wronged Asian Gamers [SWAG] - At the moment composed of Pinoys - 40+
Pro Baddies[Bad] - Indonesian Guild - 80+

------------------------------------------------------------
-------------------- Blackgate --------------------
------------------------------------------------------------
Players: (0)
xxx

Guilds:
Temasek Knights

------------------------------------------------------------
-------------------- Sanctum of Rall --------------------
------------------------------------------------------------
Players: (3)
Cheesenium (Cheesenium.8126) (if cannot get inside Sea of Sorrows or Isle of Janthir)
bontotalan & friend (Garundia.9483 [me] & pandamerah.2948 [my fren]) (if cannot get inside Sea of Sorrows)

Guilds:
xxx

------------------------------------------------------------
-------------------- Dark Haven --------------------
------------------------------------------------------------
Players: (1)
DCboii (DeCree.5698) of Guild Not Another Gaming Acronym[NAGA] (about 18 people)

Guilds:
Guild Not Another Gaming Acronym[NAGA]