Could the planet in the trailer be Endor proper instead of the sanctuary moon? I’ve always assumed Endor was a gas giant, but I don’t think there’s currently anything in the cannon to support or refute that.

Anyway, the more I think about it, the more convinced I am that part of the plot will involve our heroes racing against Kylo and the Knights of Ren to find some sort of Emperor-related macguffin. Maybe some trap that Palestine set up decades ago with an especially long fuse goes off and everyone believes there’s some means of stopping and/or controlling it somewhere in the Death Star II wreckage.

(That’s my theory as long as we’re limiting speculation to the Death Stars we’ve already seen, that is. I remember a couple more kicking around in Legends, and I wouldn’t be gobsmacked to find out there was a heretofore unseen prototype left over in canon too)