That super sleuth at Daisy Ridley News spoke to an extra:
“stunts, explosions, robots, star troopers, yes yes I need more sand in my mouth!
I asked for clarification and Ridley News responded:
If accurate, that can have huge ramifications for the the state of the galaxy in the film. If Stormtroopers are still around, The Galactic Empire was never crushed and the war has raged on this entire time. Pretty interesting what it all could mean.
This lines up with some of the news we have heard from Abu Dhabi about huge explosions, crashed ships and such. It should also be noted that the original reports of that stuff was semi-validated when J.J. Abrams showed up in a “centuries old market” in that video.