The star shower from the clouds above crystarium in the trailer is the same one as in that cutscene early game with hydaelyn and that echo vision from 1.0. ( did some research).

I wouldnt be surprised if that is a part of the original calamity, not to mention it appears to happen in crystarium too and we see zenos in the fake amaurot
during its destruction.

Bruh

This makes me so curious.