Dark Knight

Holy crap, they actually did it. My brother and I have been saying for years that they could've just called the "new" Batman, "Dark Knight" and now I come to find that the sequel to Batman Begins will be called The Dark Knight. Now I'm just not so sure about Heath Ledger playing the Joker; who can possibly top Nicolson? Why re-introduce the Joker anyway? Can we get some new bad guys please?