Speaking of Wedge, I think I know why he's in the parachute with Cloud in the trailer instead of Jessie. Biggs is a pretty lean guy, and he doesn't seem to have the physical strength to support Wedge's weight in the air - just look how small he looks next to Wedge when they're getting on the motorcycles. But Cloud does have the necessary strength, hence the switch from how they had been paired on the bikes. Otherwise I'm sure Jess would have been in the parachute with Cloud, which was what she had probably wanted but couldn't do thanks to Wedge.
Another thing I noticed was that at the start of the trailer, some of the first few lines might not happen when we think they do. These are the lines I'm talking about:
Tifa: Barret! Jessie!
Barret: The hell you been!?
We don't actually see them saying these lines, we just see the battle in the slums when the spirits attack. And lines tend to be moved around in trailers sometimes to different parts than when they actually appear in the game or movie, so it's possible that those lines are actually said when Cloud and Tifa get to the top of the Sector 7 pillar to stop the plate collapse. And if that's true, then from Tifa's words, that would mean that Jessie is there with Barret when you get there, unlike in the OG where it's just Barret after you've already found Jess wounded near the top.
Those lines, along with what I mentioned before about the footage we saw of the pillar fight and how we saw Biggs, Wedge, and a couple other AVALANCHE guys staying behind and fighting while Barret and Jessie kept climbing, would seem to show that this time, Jessie makes it to the top unharmed alongside Barret. So this likely means she'll have an on-screen death at some point after we get to the top. As she's the tech expert of the group, she's probably the only one who would have been able to successfully disarm the bomb, and that's probably why Shinra would target her first out of the four of them, especially if she's in the middle of actually working on it.
I could see them having Reno do it, since you get into a boss fight with him right afterward, which echoes how you fight Jenova LIFE right after Sephiroth kills Aerith later on in the overall FFVII story. Not sure whether it would be before or after he jumps down, but it seems like they're making the Turks out to be a lot more dangerous this time, so I'm sure he could do it. Cloud tells Aerith that murder is one of the things they do, so it's definitely possible. And in the trailer, you only see Cloud fighting Reno at the top of the pillar - where are Barret and Tifa? The trailer didn't show us much up there, just a few shots of Cloud and Reno going at it before cutting to the next segment.
Anyway, it's gonna be tough when the AVALANCHE trio does go, but I suspect that SE is going to make Jessie's end especially painful given how much footage she's gotten already, especially compared to Biggs and Wedge, and how much they've expanded her character. So much so that, from what I understand, she's the first of the cast that you actually see in the game when she hijacks that Shinra propaganda video. I could be wrong about that, though. I've only read a little about that part.