I want teh riddler~~~~D:

While I do like the Riddler, I'm not too sure how he'd play in this particular tone of movie. Hopefully they'd play up the psychological tension that must be present to make someone compulsively tip off his crimes. Sure, it could be portrayed as a certain arrogance, i.e. "You'll never catch me even if I give you a hint." I'd hope they'd show it as Nigma NOT wanting to give his riddles, but unable to prevent himself from doing so due to his compulsion. I'm not sure he'll be enough to carry a whole movie, though. Maybe there will be some Catwoman sexual tension thrown into the mix.

My guess for the next villain is not the normal thinking. The movie was partially based on a 4 book comic series DC did 3-4 years back. And the next villian would technically be The Holiday Killer. I will rep you if you know who that is :)
Being as the Marrone was a survivor of the movie, Its definately a possiblity thats who it will be.

Hmm, certainly Batman Beings and Dark Knight draw some inspiration from Year One and The Long Halloween, but it diverges enough to where they could introduce any character they want, really.