From what I saw, it looked like improved specular maps, geometry, polycount and particle engine.
I mean, really now. This is Square. If there's one thing they know how to do consistently, it's to deliver really pretty CG, in-game or otherwise.
Were you looking at the trailer through some crappy H.264 codec?
They somewhat resemble the emptiness, but what I meant was all the enemies on the boat looked alike.
I'm reasonably assuming that it was a hive or large swarm of jellyfish-esque monsters. Do they have to be individually identifiable?