from SHH:

I have seen The Dark Knight Teaser. I don't want to reveal everything...

It starts out with the WB logo gracing the screen, followed by the DC logo and the Legendary pictures logo. The screen goes black.

It opens back up as a commercial paid for by the friends of Harvey Dent. We are shown shots of him talking, making public speeches, and walking in a suit, while a deep voice comes on and talks about Harvey Dent. A generic politician commercial.

What seems to be halfway through the commercial, it is interrupted by static, and blacks out. Out of nowhere a crystal clear image comes onto the screen of a blacked out man with large windows behind him. The camera slowly zooms in on him. He's talking (about what I won't say) and as he finishes he begins laughing. Lightning strikes, lighting up his face, as the laughter grows more manic. Cut to black.

The Batman Begins (now The Dark Knight's bat) emblem is shown with the words The Dark Knight. Then it says Summer 2008 and has the website at the bottom.

What is said... is a surprise that I must keep for now. It gave me chills.