The more we learn about hydaelyn the more it sounds like the ivalice story.

A floating continent so high airships can't reach it - giruvegan
12 scions of light/dark - dieties/ascians (with the white ascian being the 13th serpent zodiac)
allagans using ancient tech to control dragons - Occuria controlling dragons

Then you have the Occuria's thousand year war against the espers and locking zodiark away.

I'm not saying hydaelyn is ivalice but i think they might be lifting elements of the story.