I'm excited for Tom Hardy, Anne Hathaway, and Joseph Gordon-Levitt. I think they are all great actors, and are definitely gonna add to the movie. However, I think Anne Hathaway as Catwoman is gonna be the sleeper hit for most people. A lot of people are confused at her casting, and even saying it's a bad choice. Well, same happened with Ledger and we all saw what happened. Besides that, I think Catwoman is such an awesome character. Love her in the comics, the games, and in Returns. I think she just offers a unique factor to whatever story she's in with Batman and another villain. Her neutrality and relationship with Bruce/Batman is very interesting.
I do fully believe she will have some awesome moments to win over all fans, doubters included. She will have her "pencil trick" moment i'm sure that will excite/wow the crowd, likely early on in the movie. Leaving them wanting to see more from her. Heck, where it appears she breaks a guy's wrist in prison by doing a no handed cartwheel with his wrists through the bars, is pretty bad ass in itself.
JGL is also very interesting, and i'm curious to see what his character will do.
Bane is gonna be a much popular character after this movie, i'm pretty positive of that. Seeing as he hasn't had a great movie iteration yet, it's gonna really make him a big name villain to the casual audience as well.