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.
Yeah try harder next time. That is a really terrible photoshop job, look at the maps icon. A little bit of extra persistence and you could have extracted the maps icon from the app. And how blurry is that casing? Total lack of attention to detail.
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.