While Batman 3 still technically lives in limbo, The Dark Knight's Aaron Eckhart wouldn't object to a return to the franchise, should Christopher Nolan officially decide to make it. There's only one issue: Eckhart's character, Harvey Dent a.k.a Two-Face, fell off a construction site, and, sort of, well, died. Eckhart explained to MTV that Two-Face's death complicates his return.
As far as I'm concerned, my character's dead. I've sort of just gone on with my life. I don't have any expectations of being in the next Dark Knight, if there is a Dark Knight.
Still, Eckhart would return, if Nolan wanted him to.
If Chris called me, I would certainly do it. I would do anything for Chris. If Chris wanted me to ... I don't know, bring his tea or something like that, I would do it. I had such a good time making that movie, and he's such a great filmmaker.
It isn't too hard to see how Eckhart could return. Considering Gary Oldman's Commissioner Gordon fakes his death in The Dark Knight, Eckhart's Two-Face could do the same, opening up the possibility of a return. However, Eckhart thinks that Batman 3 may focus instead on new villains.
I think [Dark Knight] was always Heath [Ledger]'s movie, and Heath was
definitely the motor and the vehicle that was to continue on. I'm not sure that it's not better just to start all over and find different characters for the [next] movie.