It looks rather convincing and appears to advertise a code for World of Warcraft on the front, which StarCraft 2 did. This is as close as we can get right now people!
The Internet is naturally creaming its collective community pants over this but Blizzard is unlikely to comment. If it is the real deal then does your inner Diablo addict find it pleasing to the eye? Diablo III releases exclusively PC but there’s conception for consoles.