Seeing how vehemently Barret denies being allied with Wutai, it makes me look forward to his interactions with Yuffie in (presumably) Part 2 onward given his apparent distaste for her homeland. Should be more interesting and complex than in the OG, especially with Shinra using fear of Wutai the way they seem to be doing for their own ends.
Hopefully they'll drop another trailer by the end of TGS like they did with E3 and we'll get a peek at Red XIII, Rufus, and Wall Market Tifa. We saw Hundred Gunner in this trailer, so I'd say it's a decent possibility that we'll see Red in the next one, given that they took a similar approach with Tifa - revealed parts of the Aps fight in two trailers, then finally revealed her with more of that same fight in the E3 trailer.
Another thing I noticed when watching the trailer more slowly was that during the Sector 7 pillar segment where AVALANCHE is climbing the pillar, there are a couple quick shots of what might be from Biggs' and Wedge's last stands - nothing conclusive, of course, but bits that show them on their own apart from the others and fighting Shinra soldiers as though they were staying behind to give Barret and Jess time to reach the top. The shot of Biggs with his gun, for instance, and Wedge facing the soldiers alone. But they showed no such moment for Jessie. The last they showed of her in that scene, she was heading with Barret up the stairs, which follows the OG, where you find her near the top.
But as they never showed her alone at any time during that sequence the way they did with Biggs and Wedge, it's possible that her end in particular is something they're really trying to make emotional and gutwrenching since they didn't give any hint of it like they did for the guys. She's gotten more dialogue and screen time in the trailers than they have, so it seems SE's wanting us to get attached to her, which would make her loss hit that much harder when it happens, especially since we'll have more time with her and the guys in the game than we did in the OG. So Jessie may end up having the "Aerith moment" of Remake Part 1, if you know what I mean. Not at the hands of Sephy, obviously, but Shinra's forces. Or maybe even Reno, at some point after he jumps off the helicopter and starts fighting with Cloud. I guess we'll find out in March. In any case, it's going to be a hard moment no matter how it happens.