I'm hoping for the "Weeping Angel" mobs he mentioned in one of the stream interviews, I think it was Brocraft. Monsters that teleport when you're not looking? YES PLEASE.
thats from Dr. Who... Stone demons that were solid as ling as they are being looked at. When you blink or look away they move at supersonic speeds to kill you and your slime friends. I hope this doesnt happen... That scared the **** out of me.