Doomsday is in BvS. Leto's Joker used to be Robin. I've pretty much accepted these as fact already and I for one am excited. If these are both indeed true which I am 99.9% sure they are at this point, I'm really glad at what Snyder/DC are doing with this. This makes things very interesting. I'm also hoping that there is a real Joker that we haven't seen yet. The heat between Batman and real Joker when we finally see them face off will be immense. If Joker was indeed able to drive a Robin to the point of insanity and become the very thing he was fighting against then Batman must absolutely hate the Joker.