I think this interpretation of Two Face is much better than any done before. This should be the defining version of Two Face. He's become a lot more now than a gangster with a messed up face, and a tommy gun.
I loved the movie, my only concern is where are they going to take the series now. I personally thought that leaving Joker's ending open like that called for him to return in the finale of the trilogy and be the main villain (He is after all, the epitome of Batman villains) but now that Heath is dead, and Two-Face is dead in the film world, I'm concerned as to where they are going to go.
Plot wise though, I was really surprised when Rachelle Dawes died and I thought it was a really good twist. I thought Batman was going to save Rachelle and then through the phone he'd hear Batman saving her, and he would think he was going to die, but instead he lives and becomes Two-Face and loses his mind, with his last sane thoughts being of saving Rachelle not him, and saw Batman condemned him to become Two-Face. But when what actually happened, happened I was surprised and didn't mind the twist at all.
Also, now knowing that they probably won't use Joker in the next film, I wish they had a different ending for Joker other than just leaving him upside down. I was hoping that Joker would "break" Batman mentally and eventually Batman would kill Joker. But that didn't happen. And I think I only really think that because now that Heath is dead, Joker can't really return for the next movie. Otherwise I wouldn't have wanted him dead.
Ah, so much to talk about and speculate about! Great movie, definitely want to see it in theatres again.