The ones that really interest me:
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*The sidequest "A Relic Reborn" will be available after the start of official service.
Not sure I have done this or not...
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By forming a free company, players will gain access to a company chest, which can be used to share items between free company members. In addition, members can accrue free company experience points and free company credits.
Accruing free company experience points will unlock the following features:
By speaking with the OIC officer of arms in any of the three cities, players can create a company crest.
The maximum capacity of the company chest will increase.
By speaking with the OIC officer of arms in any of the three cities, players can affix their company crest to gear.
Free company actions will become available
The following actions can be purchased from OIC quartermasters using company credits:
The Heat of Battle - Increases EXP earned through battle
Earth and Water - Increases EXP earned through gathering.
Helping Hand - Increases EXP earned through crafting.
A Man's Best Friend - Increases EXP earned by companions.
Brave New World - Increases the attributes of all members under level 10.
Live off the Land - Increases Gathering.
What You See - Increases Perception.
What You See - Increases Perception.
In Control - Increases Control.
That Which Binds Us - Increases spiritbonding speed.
Meat and Mead - Increases duration of food effects.
Proper Care - Slows gear wear.
Back on Your Feet - Reduces the duration of Weakness.
Reduced Rates - Reduces teleportation fees.
*Because chocobo companions are not available during phase 4, A Man's Best Friend will have no effect.
Purchased actions can be accessed under Actions in the Free Company menu.
The FC bonus just like GW2? and FC crest
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In the event one or more members of the party have yet to clear the instance, all party members will receive a bonus upon completion.
*This bonus only applies to instances below level 50.
In the event a player fails to complete a quest battle several times, they will receive an enhancement effect upon trying again.
Players will receive experience points when entering a new area for the first time.
*Experience received is dependent upon your current class.
After unlocking a second battle class, players will receive an experience point bonus known as the Armoury bonus when slaying enemies and participating in FATE.
This bonus is only applicable to classes other than your highest level battle class.
Bonus bonus bonus... FF14 ARR really gets easier
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Leveling any crafting class to level 10 will unlock the Quick Synthesis option. Once unlocked, a quick synthesis button will appear in the Crafting Log.
Quick synthesis

no more crafting the same thing over and over again.
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new emotes have been added.
/visor - Open or close helm visors.
gonna try this on warrior af helm