
The GDR3 update brings features and changes such as a driving mode, option to close apps from the multitasking/recent apps screen, ability to use Wi-Fi to set up a new device, lock the orientation of the screen to landscape or portrait, custom ringtones for more items like IMs, personalized call/text ringtones based upon contacts, and Bluetooth internet sharing; GDR3 also adds support for 1080p displays and faster processors (specifically, the Snapdragon 800), though these are features that you won't be getting unless you buy a new WP8 device (which, today, means buying a Nokia phone).
Have any of you received the update yet?