The Xbox One Slim will be 40% smaller in size than the current Xbox One.
The second image shows off the Xbox One Slim's vertical stand.
This is the first revision for the Xbox One, but certainly not the first Xbox hardware revision. Throughout the lifetime of the Xbox 360, we saw various versions including the Premium, the Slim, and the E.
Expect more details on the Xbox One Slim in the Microsoft E3 show tomorrow, including its price and release date.