I really hope she stays away from the movie. And I don't want to see Batgirl too, even if the cast a uber-hot babe I don't think it's a good idea.
Nolan doesn't like Penguin, Catwoman, Batgirl, or Robin. He also says Two-Face/Dent is dead. So don't expect any of that. Hush seems like a good choice but maybe too obscure for the mainstream.
I remember some rumors last year about Johnny Depp as Riddler and Philip Seymour Hoffman as Penguin. Edit: This was worse.
Riddler would be fine if done as some kind of Kevin Spacy in Se7en psycho who leaves clues, but that kind of thing has been done a lot in thrillers/crime dramas already.
Miley Cyrus has no talent, and she is ugly as hell. If they cast her I'm not even gonna watch the movie. She will ruin it. Please don't be stupid.
I heard that Angelina Jolie was gonna play Catwoman. A friend of mines said he'd rather see Kate Beckinsel play Catwoman. I would agree, she does rock the spandex leather well, and I dig UnderWorld.