Friday night I mentioned this to a friend who was quick to correct me when I called it a "trailer." In a bitter tone, he said "You mean the teaser? It's not a trailer if there's no footage."
Regardless, while it's probably a fine teaser for most, I was a little let down for the simple fact of being spoiled by the local filming taking place.
While I'd never post a "spoiler" on a message board, I can tell you that there's some pretty sweet, albeit spoiler-heavy footage on a blog called hollywoodchicago.com
If you want to see video of Ledger in full make-up, shit blowing up, and some stunts being performed...that's the place to look. If you're staying spoiler-free, definitely avoid that site.