That image looks really fake... look how blurry the the soft buttons down the bottom are. The Chrome icon is also cut off a little on the left, and the app list button looks like it was made in MS Paint.

The store description in image #4 is also far too short.

If you look at the default wallpaper for the Nexus 7, you can see it makes a "7" shape. Same for the leaked photos of the Nexus 5, except with a "5" shape. However, the background in this photo doesn't show a "10", it shows something similar to the Nexus 5's "5" background.

So I'm fairly certain this is fake.