I love this, I really do. Whenever a new trailer comes out, one hiding clues all about, somebody takes it upon themselves to decipher the clues. This time around? GameTrailers. They do a hell of a job, too.
Catwoman, Penguin, Dr. Freeze and Two-Face are all likely villains. For one, that Uncle Sam poster with the piece torn off at the face with the gun? Look closer at his left hand. See the discoloration? Pan your vision pack a bit, and you'll see that his entire left side has been dirtied. That, my friends, is your Harvey Dent.