Batman once described The Joker in "The Joker's Five way Revenge" as "a one man plague. He comes, he kills and disappears" and I think that's the way they're going with him. We're going to see more of The Joker's handy-work than the man himself. It'll give us a chance to understand why people fear him, how his killings are near supernatural in efficency, and feel the protagonists frustration to catch a man that seemingly can't be caught. And will add a boost to The Joker making him that much more ominious and sinister.
If I'm right, it's going be something different and awesome.