Nokia has started work on the Windows Phone 7.8 update for its existing line-up of Lumia devices. Polish Forum WindowsMania.pl posted some images of the Nokia Lumia 800 running Windows Phone 7.8 beta versions/test build. The test build shows not only a Windows Phone 8-like homescreen, but also a number of changes in the app icons.
Here are a few images of the Nokia Lumia 800 running Windows Phone 7.8 build. 
The source has also made a video of the Windows Phone 7.8 and has uploaded it on YouTube.
Images of Nokia Lumia 800 running WP 7.8 spotted online
Polish forum has images of Lumia 800 running Windows Phone 7.8 and shows what's in store for users.
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