Blizzard have confirmed in an interview with DiabloFans that we won't see Diablo III at the PS4 launch. As you may know the PS3 and Xbox 360 versions of the game are set for release in September.
"The team has just received the new console generation development kits so the translation to those platforms is yet to be done."
Blizzard also mentioned plans for the trackpad and Share button. No word yet on whether the game will also make it onto Xbox One, but chances are good that's happening at some point.