Windows Phone 7.8 Update 7.10.8862.144
I got the above update couple of days earlier to my HTC Mozart device. At this, check its build number - 7.10.8862.144 (You'll see same on your phone in Settings > About > More info). It contains the following update:
Start. Provides resizable small, medium, and large Live Tiles so you can customize your Start experience in new ways.
Accent colors. Expands the number of available accent colors to 20.
Lock screen. Improves the lock screen experience with accidental wipe protection features and the Bing image of the day wallpaper.
Marketplace and Xbox. Expands Windows Phone Marketplace and Xbox support to new countries and regions.
Fonts. Enhances the Chinese font and improves the appearance of Arabic and other languages.
Live Tiles. Fixes performance issues from a previous update.
Other improvements. Includes many other improvements to Windows Phone.
For more information, you can refer: http://www.windowsphone.com/en-us/how-to/wp7/basics/update-history…. Enjoy!!