With Christopher Nolan being my favorite director of all time, I would see it if he called it "Batman Junior's Revenge on the Candyman."
Also, I think the Riddler would be a bit too much like the Joker. I personally think that Catwoman would make an interesting addition, perhaps not as the main villain but because of her being a somewhat morally ambiguous character.
In regards to 3D, I am as well very glad that Nolan is once again resisting the urge to make the movie 3D. I feel like it would take away from the grittiness of the batman movies if he did that.