Windows Phone 7.8 is designed to give those with the limited hardware capabilities of Windows Phone 7, the opportunity to get a taste of Windows Phone 8. It offers the resizeable Live Tiles as seen on Windows Phone 8, new color themes for the device, a Bing lock screen Wallpaper of the Day and more. Some have suggested that Microsoft did not want to release the update during the holidays for feat that it would keep some Windows Phone owners from upgrading to Windows Phone 8.
Last month, some Nokia Lumia 800 models overseas started to receive Windows Phone 7.8, but that turned out to be a limited test conducted by Nokia, which said that the real thing will take place in the first quarter of 2013.
source: pocketgamer.biz via DailyMobile