Blizzard has announced at Blizzcon that if you buy a 1 year subscription to their popular MMO, you will receive the full Diablo 3 for free, to keep. With 1 year costing more than $140, this would really only make sense if you really wanted to play World of Warcraft for a year anyway.

The only other thing of note they announced was the new box art. You can see the result of their development effort below.