I'm gagging to get my hands on Diablo 3. I doubt any kind of console version would cause delays, surely they would have additional teams working on that aspect of the development? God knows they have the funds to pull such a trick :P
I'm not exactly pro console, but years back I actually played Diablo 1 on my ps1, from what I can remember it played quite well. The pc version was still better tho! (pc ftw as we all know :P)