Looks like the first expansion for Diablo III will indeed be titled Reaper of Souls. Blizzard revealed its gorgeous opening cinematic as well as a bit of gameplay, both of which you can find after the jump.
They also shed some light on what it’s all about. In it, the fallen Angel of Wisdom, Malthael, is the new big baddie now that Diablo’s been defeated (belated spoiler?). The expansion will bring with it brand spanking new monsters, environments and loot, too. I can’t wait.