This from geekachicas.com:
"Ok, the film starts shooting in April 2011 and the rumor mill will not stop running, BUT, one man may have shined some light into the whole foundation to the next Batman 3 Movie. Actor Aaron Eckhart told MTV news at Comic-con that he has been asked by Christopher Nolan to reprise his role as Harvey Dent/ Two Face. YOU CAN BET YOUR SWEET ASS, that I'm loving this news. We could see a Dark Halloween type of film as Two-Face gears up the freaks to end the mob once and for all."
Take this rumor with a whole bunch of salt. For some reason I don't see Nolan bringing back Two-Face. Could he? Yes. Will he? That's another ball of wax entirely. The most important question here is should he? I don't think so. To keep the continuity that Nolan has already established with his first two bat films, I say Two Face stays dead. Besides if Leonardo Dicaprio gets the role of The Riddler in Nolan's third Bat movie, he isn't going to share screen time with a villain that Nolan himself has said is kaput. Nuff said.