Gotta say, I can totally see Jared Leto as Joker. Based on what I've seen him in, he might be good for a more playful and mischievous version of the Joker, the kind that has surprise jack-in-a-box fists knocking people out and is always grinning. Not nearly as serious as Heath Ledger's depiction, nor as nutty as Mark Hamill's performances, but something in between.