Techland asked Blizzard’s executive vice president of game design Rob Pardo why the heck it’s taking so long.
“We always announce all of our games too early,” Pardo said, referring to when Diablo III was unveiled at Blizzard’s Worldwide Invitational in 2008. “We realize that and go, ‘You know what? Next time we’re not going to do that.’ And then we always fail at that. But I’d rather fail at that than fail at making the game great. I think it’s safe to say that, yeah, (Diablo III) is not going to be out next year.”
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source : Techland