J.J. Abrams himself has stated via Entertainment Weekly regarding The Force Awakens presence at D23:
“It is true, we are showing no footage, behind the scenes or otherwise,” director J.J. Abrams tells EW. “In the fall, there’ll be a trailer.”
For people hoping to see official Episode VII merchandise shown at D23, I wouldn’t hold my breath for that. It’s all coming after Sept. 4.