Windows 8.1 will let you use your desktop wallpaper on the Start Screen
Another update from Paul Thurrott today.
Seems like Windows 8.1 will let you update the background of your Start Screen with custom wallpaper.
The wallpaper in the image above is not from Windows 8.1 but is an image that Thurrott had posted.
It seems like this functionality will start as being off by default.