I am trying to get an answer on this as well. Where is everyone getting the idea that we are time traveling now!? I realize that the narration from the trailer says something about time but why? Why would we see screen shots with dialouge talking about rebuilding and such?

So Dalamud hits, yes. I would speculate that it is a controlled hit contained by Louis and a team of NPC's. Maybe contained the blast? So we see a city (Ul'dah) getting hit pretty hard from the cinematic. OK. The Dalamud area, where is that hitting? And what is the structure behind the Behemoth in the trailer? Someone mentioned an act from FF13 where with the Cocoon incident...That structure looks awfully similar, maybe Dalamud is frozen? And the destruction we are cleaning up is from the Meteor attack?

Just food for thought and completely just from my point of view. (Meaning of course, I can be wrong and understand it)