So What’s New in GDR 3 (All WP8) and Bittersweet Shimmer (Lumia WP8 Only)
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.
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 Offices files (.doc, .xls, .ppt) and .pdf files in email.
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.