Talking to Gamasutra he states, "I think even a shorter-term concern is whether or not we might see cannibalization of WoW players from Diablo III when we launch it, because it's a similar type of experience. Not exactly similar, but it's that RPG feel." Pearce doesn't have an issue with this happening, saying, " ... because if we cannibalize them ourselves, they're still a Blizzard customer." Now all we need for Blizzard to do is give Diablo III a release date.
Gallery: Diablo III Screenshots