According to The HD Room, Summit Entertainment will be presenting footage Breaking Dawn Part 1 at Comic Con San Diego in July. They are also reporting that the stars of the movie will be in attendance:
This year’s Comic-Con in particular is poised to be perhaps the biggest yet. In a battle of screaming female tweens versus comic book faithful, Summit Entertainment will present new footage and the stars of The Twilight Saga: Breaking Dawn Part 1 while Marvel and Paramount will counter with likely the first public footage from The Avengers