Despite not having a panel at SDCC, there is some Star Wars presence there with a display of props and costumes of the Resistance. The official site has some photos of them. The most interesting one is the new Abednedo pilot named C’ai Threnalli as the others are costumes we already saw in The Force Awakens. If you remember, we first saw C’ai Threnalli in the Force For Change video with Daisy Ridley walking in the background. There isn’t much difference with Ello Asty, the Abednedo pilot who died in The Force Awakens except the helmet it has different markings.
A skillful fighter pilot of Abednedo descent, C’ai Threnalli flies as Poe Dameron’s wingman following the evacuation of D’Qar.
The description mentions the evacuation of D’Qar, which suggests that the space battle we saw in the trailer was above D’Qar.
The other costumes feature Poe Dameron, BB-8 and Nien Nunb.