Yesterday, Eurogamer's interview with Vice President of Game Design Rob Pardo has him admitting that a console version of Diablo 3 is "theoretically posssible" but some changes to the controls would have to be made. He conceded that the game is "of our major franchises, the one that's most console friendly, for sure," and that "Diablo would be the easiest game to translate. But it would still take a bit of work."
We honestly think this is a just PR speak for "no" to Diablo 3 on PS3, at least not at the same time as the PC and Mac versions. We wouldn't get our hopes up!
Source -- Eurogamer
Source -- Guardian Games blog
[Thanks, Kristopher G.!]