Well if Nolan repeats the previous two movies, the third shall rock. We will see, though. I personally think it will be great. The last two did not let down. I can't decide which I like best. Both have amazing elements. I'd have to say, though, that Heath Ledger's Joker was the best villain of the two movies, hands down. If they play Selena Kyle like the comics, then she and Bruce will be having some sexual tension, which will be different for the new batman franchise.
I want to know how Batman is going to clear himself after sacrificing his image (what little he had, admittedly). That shall be awesome, done right.