Well, no new trailer or clip coming to SDCC.
http://www.ew.com/article/2015/07/06/star-wars-comic-con-panel
Perfectly fine with me, since teaser 2 wasn't that long ago AND I usually like watching behind-the-scenes featurettes to get a look into a movie instead, like PJ's vlogs for The Hobbit. September feels like a good place for another trailer, one that shows a grander view of the feel of the movie, but still hides the plot away.