Thanks to a neoGAF users we now can see both boxes for PlayStation 4 and Xbox One. Both look good and unique in their own way.
PlayStation 4’s box is blue colored, with the logo in the left side and a picture of the console on the right side.

Xbox One’s box is black and half of it features several pictures of the console, from a few different angles, while the Xbox One official logo is shown on a darker background.

You can see the both designes below: