I was going to make a thread on this right now, with the exact same link and title.
Trailer is most awesome one I've seen since 300, and I'm all hyped up for The Joker. Hell, I doubt if anyone will even be looking at Batman when The Joker is up on screen.
Heath Ledger looks awesome and the new Joker is an interesting look. He doesn't have the excessive smiling and joke-cracking, though. He's a lot more serious - something like a psychopath terrorist-gangster hybrid. But ****, he's awesome nevertheless.
I wonder who all those people in black were. The ones who scatter about midway through the trailer.