Wizarduniverse.com also posted a detailed description of the footage that was shown during the Wizard World convention. Here is an excerpt:
The footage started with a silhouette of a dark figure in front of one of Batman's armored vehicles before quickly cutting to Bruce Wayne and Alfred delivering the brief lines heard in the The Dark Knight teaser trailer.
"Some people just want to watch the world burn," advises Alfred before the camera jumps to Batman in action on the Batpod, the new iteration of his motorcycle.
The action built up as the Joker was seen in full for the first time with a mess of white face, smeared red lipstick and sweaty, straggly green hair. Apparently, the clown prince of crime gets arrested at one point in the film, as the montage presented Jim Gordon (complete in SWAT gear) at the Joker's booking, saying, "no prints, no ID, custom clothes, no tags." The clown smiles with what appears to be blood over his face from the inside of an interrogation room.
Checking back in with Bruce Wayne, the billionaire playboy has a brief scene with Eckhart's Harvey Dent where he says "Rachel's told me everything about you."
"I truly hope not," responds Wayne.
The Dark Knight opens next summer on July 18th, 2008.
The Dark Knight was released July 18th, 2008 and stars Christian Bale, Heath Ledger, Aaron Eckhart, Michael Caine, Maggie Gyllenhaal, Gary Oldman, Morgan Freeman, Monique Gabriela Curnen. The film is directed by Christopher Nolan.