So given that Nolan's Batman has explanations for everything (training, he doesn't make all his own gear because Lucius is helping, etc), Nolan's Joker is going to have to be grounded in the real world to a certain and significant extent. Movies--stories--ask you to suspend disbelief, sure. But you can't expect the audience to suspend significantly MORE disbelief about one character in the movie, or the tone of the story falls apart and it becomes very tawdry. So we can't have a Batman that gets all of his gear in plausible ways and then a Joker that--ALL OF A SUDDEN! FOR NO GOOD REASON! (thanks, Burton)--has a bunch of mime trained goons and rigged gag toys. I think this Joker is going to be a lot more about working with fairy ordinary things and making them uncomfortable and gruesome, rather than going for bright and cheap and cheesy "TA DA!" moments that would take a hell of a lot of resources to pull off.