Here's a snippet from the interview. The following quote relates to Diablo III's supposed similarities with Blizzard's other game, World of Warcraft:
Kotaku: In the demo you showed during the Opening Ceremony, you gave us a glimpse at the Witch Doctor class which seems to use several spells similar to those found in World of Warcraft. Do you worry that some fans will think you’re just copying aspects of WoW?Feel free to share your thoughts on the matter.
Jay Wilson: No. Do I think people will say that? Yes, I think they will. One of the things I like to remind people is that it’s okay to steal from ourselves. A good idea is a good idea and a good skill is a good skill and so when we look across all our games we borrow from each other all of the time. But the really key and important thing is do we play like World of Warcraft? No! We don’t play anything like it, Diablo has a different feel to it and that’s fine. If we look at the history of Blizzard games, at Warcraft I and II, the spell Blizzard appeared, it also appeared in WoW and Diablo II. I almost think it’s more like a signature but as long as a game has enough original stuff that it stands on its own and plays like its own game, that’s what matters.