The slash writes itself

Warner Brothers announces the official title of the next Bat-flick will be The Dark Knight, and Heath Ledger is confirmed to play the Joker. Slashtastic! (And you folks complaining about Ledger’s turn in Brokeback Mountain damaging the franchise may want to rent Velvet Goldmine.)

Rumor says they want Philip Seymour Hoffman for the Penguin, and Ryan Phillippe is a possibility for Harvey Dent/Two-Face.