Blizzard Entertainment and Sony have confirmed via the official PlayStation Blog that Diablo III: Reaper of Souls will be released on PlayStation 4. In fact Reaper of Souls will be playable on PS4 (as well as PC) at next month's BlizzCon (November 8-9).
It's unknown whether PS3 and Xbox 360 will also see a release of the expansion and there is still no word whether Diablo III will make it onto Xbox One.