While some Weapons might wake up earlier (the one in the trailer looked like a Rebirth original design). I don’t think the main big ones like Ultimate and Diamond are going to wake up in Rebirth. Those are far more associated with waking up at the Northern Crater than the others.Hmmm, that's interesting. While I doubt that means right after Aerith is killed, I wonder what it could be. Leaving off right after the Weapons are awakened makes more sense to me, I'm still open for whatever
The final boss battle battle will probably be built around Jenova LIFE. And I imagine Jenova-as-Sephiroth will serve as Rebirth’s obligatory Sephiroth boss fight (instead of immediately transforming into Jenova LIFE).