NEWSFLASH FOR ALL GEEKS - TWO-FACE = DEAD. Thats it. Hes dead. Deal with it. Hes not coming back I dont care how badly you want it, hes dead. You got that? Dead.
People who think the Joker and Riddler are too alike obviously aren't familiar with how Riddler has been written lately in the comics and graphic novels. They seem to only know the made up Tim Burton Riddler which is just Jim doing an over the top Gorshin impression
The real Riddler isn't all that hands on, hes not as in the open and laying down the law to the mafia crazy. He isn't trying to destroy the entire city to prove some point about the hopelessness of Gotham.
Joker is straight Looney Tunes. Maybe people didn't agree with Heath's look, but he nailed the Joker in the way he behaved.
Riddler is a genius and a whole differant kind of crazy. Hes far more reserved then Jims semi-retarded Mask impersination and for that matter then the Joker. Riddler is even more mysterious then Joker, he operates in the shadows, he uses his brain instead of rocket launchers and 18 wheelers.
Like I said alot before, Catwoman is sexy as hell but a bad idea, Two-Face and Penguin and Bane will not happen so don't get your hopes up. They aren't threatening enough to carry a sequel against Joker. Nolan already said no Catwoman, he isnt Sam Raimi and going to sumbit to some dumb fan pressure to ruin a sequel like Sam did with Venom.
Hush and Riddler. It will work, it can be as good as Joker, just as deadly, and a differant kind of feel. If you don't believe me go read Hush right now, go ahead Ill wait. If you really know Batman comics and the sources Nolan has drawn from, you cannot deny that with the situation Bats is in right now in the Nolan-verse(a criminal on the run trying to conceal his identity) these villains are perfect. Add Harvey Bullock and maybe Hugo Strange. Add the new Batcave and new Batmobile. Dark Knight can be topped, maybe not in ticket sales, but in quality. "You'll see, I'll show you."