Dark Knight Teaser At Comic-Con/The Simpsons Movie?

Rumor has it that Warner Bros will premiere a teaser movie trailer for the Batman Begins sequel The Dark Knight at the 10:30am Warner Bros Panel at the San Diego Comic-Con, according to SHH. The trailer would then be attached to The Simpsons Movie which hits theaters on July 27th. This sounds likely but I have my doubts. If Warner Bros were to premiere a teaser this early, why not attach it to Harry Potter? It would have been an unpaid spot (Potter is WB, Simpsons is Fox) and a much larger audience. We'll see what we can (or can't) find out, and report back.