... Okay, here's what I've got out of this.
Barret's back and now has a cybernetic arm. He should have stuck with the gun.
Reno and Rude are in the movie (I am grateful).
When Vincent's shown in the trailer, the narrator says "Geostigma... Jenova... Reunion...", so Vincent may be a more important character.
As for the cloaked figure in the wheelchair from the first trailer, I'm at a loss. Anybody have a guess as to who it might be?