Most probably first three list for GDR3 and new glance screen feature in Bittersweet Shimmer update (Lumia 520 don't support glance screen on GDR2+Amber).

Others not sure.

Another new model will be launched at Abu Dhabi? 

http://www.wpcentral.com/unannounced-nokia...odenamed-batman

Unofficial changelog for WP8 GDR3 + Bittersweet Shimmer update:

Windows Phone 8 GDR 3

-Support for 1080p display for new devices like the Lumia 1520.
-Support for new processors.
-3 medium or 6 small tiles on a row for phones with screen resolution higher than WXGA (1280 x 768) including Lumia 920, 925, 928, 1020 and of course the Lumia 1520.
-Close apps by tapping on the X on top right in multitasking view. The icon of the app appears below.
-Custom tones for text or IM, voicemail, email and reminders (confirmed earlier by Windows Phone Central)
-Screen Rotation lock: When auto-rotate screen is off, your screen will stay in the current orientation when you rotate your phone.
Driving Mode: Turns of all notifications except texts and phone calls when you're driving. You can also turn calls and texts off completely or set Driving Mode to text and automatic reply like "Hey, I am driving right now. I'll reply you later." Driving Mode can start automatically when your phone connects to a Bluetooth device.
-Connect to WiFi in OOBE when switching on your new phone for the first time or after you your reset your phone, so you can restore your data even before connecting to a cellular network.
-Attach Office files (.doc, .xls, .ppt) and .pdf files in email.

Nokia Bittersweet shimmer firmware

-Glance Screen: Notifications in glance screen similar to the notifications on the lock screen. Choose from any of the 20 accent colours for night mode instead of just red in Amber. You can choose whether you want to keep the glance screen always on when charging, in Amber it is always on when charging.
-New apps: Nokia Camera, Storyteller, etc.

http://www.wpcentral.com/changelog-gdr3-wi...ersweet-shimmer

http://www.nawzil.com/WindowsPhone8

Universal binaries. Microsoft is currently pushing the notion of universal binaries that would let developers create a single app that can run both on Windows RT and Windows Phone. This is opt-in because of size issues, apparently, but could eventually become a requirement. Where Windows Phone 8 has 33 percent "API unity" with Windows RT, Windows Phone 8.1 will hit 77 percent.

Multitasking. Microsoft has supposedly flagged multitasking as Windows Phone's biggest technical issue. GDR3 will fix some issues—it will let users manually close apps, for example—but notifications and background processes are a mess and quite inefficient. These issues will apparently be addressed by 8.1.

Bigger screens. Where GDR3 is widely expected to support 5- to 6-inch screens, 8.1 will supposedly support 7- to 10-inch screens as well. This obviously infringes on Windows RT/8.x tablets, so it's not clear what the thinking is there.

No more Back button. Aping the iPhone navigation model, Microsoft will apparently remove the Back button from the Windows Phone hardware specification with 8.1. The Back button just doesn't make sense, I was told: Users navigate away from an app by pressing the Start button and then open a new app, just like they do on iPhone. And the "back stack" is ill-understood by users: Most don't realize what they're doing when they repeatedly hit the Back button.

Low-cost/volume vs. High-cost/luxury. With the Lumia 520 and 620, Windows Phone has found its niche in the low end of the market. This has helped sales, but Microsoft has always wanted to position Windows Phone as a high-end system like iPhone, which is where the money is. Obviously, they're not going to walk away from market share gains, but low-end phones have technical limitations that harm the platform's forward progress. And this is what sank Windows PC sales when the netbook arrived. The push to 1080p screens and bigger devices will determine whether Windows Phone can break out of this mold.

Rumours of Windows Phone 8.1 "Blue" changes:
http://winsupersite.com/windows-phone/wind...1-rumors-emerge

I actually want back button. 

fantasy1989

Rumours of Windows Phone 8.1 "Blue" changes:
http://winsupersite.com/windows-phone/wind...1-rumors-emerge

I actually want back button. 

fantasy1989

Rumours of Windows Phone 8.1 "Blue" changes:
http://winsupersite.com/windows-phone/wind...1-rumors-emerge

I actually want back button. 

fantasy1989

Lol ... back button is useful but what happen to us user with old device that have back button once update to WP8.1?

I hope the back button doesn't just freeze in our phones   

Question is, what and how would they replace the Back button? I also want Forward in IE :/

Maybe still usable but no more further improvement eh ?

Then how we access multi-task?
Right now we access multi-task by long pressing the back button.
Long press windows button will bring out voice control.

Dun tell me double tap ?

Btw, Windows Phone don't have smart dial ? Like we type in the number it will show the similar number out.

Nope...but you can download app with such function though. I am using Rapdialer