So, thoughts and speculation on the trailer:

I wonder how much of the movie is really being shown here. It feels like even the Rey/Snoke scene could be as early as halfway through the film, if Luke declines to train her and Kylo arrives on the island.

We see nothing of Canto Bight.

Chewie looks, if possible, even stranger than in TFA. This is the one thing that really bugs me about the whole trailer. I’m all about them Porgs however.

There appears to be a big attack on a Republic stronghold, perhaps quite early on. If this is where Kylo decides that he can’t destroy Leia, he would fall out of favor with Snoke and Rey would replace him. I doubt very much that she would, of course, so my guess is she accepts him as her teacher. Side note, it’s irritating that they have an ‘upgraded’ medical frigate. It was annoying that it was a standard ship of the line in ROTJ, and it’s stupid that it’s remained so 30 years later.

This has the sort of action I expect of a climactic final installment of a trilogy, so it may not be too much to expect that the Republic destroys much of the First Order, or vice versa (though I doubt that). It would be refreshing to have the war somewhat settled going into the final chapter, to focus on the characters, but perhaps that’s too much to hope for.