During the panel Q & A, Eckhart spoke about whether he thought The Joker would be recast in the next film, and his character Harvey Dent(Two-Face) would make another appearance..
"To recreate what Heath has done...I just don't think it's gonna happen. That's my instinct. Obviously, Heath was supposed to reprise the role in the next one; it was written that way. I don't know if they're going to go on. I suspect they will not have the Joker."
"I'm sure Two-Face has obviously died in the last one. I'm in the dark as much as anyone else,"
On returning for the 3rd movie if asked...
"That's something you can't say no to. I never thought I'd be in a Batman first of all; then when you're with Chris and a script like that, with those kinds of actors, it transcends any genre. You're just working on something really special. I would always work with Chris Nolan if he asked me to."
We already heard from Nolan that Two-Face is "Dead as a Dodo". But I can't help hoping that with a lack of any really great villains left to use that he might reconsider, especially given Eckhart's enthusiasm to return. Anyway, I realize its never gonna happen, but we can dream!