EDIT: Apologies to Moose for taking his patented 'Revelations from..' Thread Titling without permission, it just seemed the like the natural thing to write
So the Shadowbringers promotional site is up now:
https://eu.finalfantasyxiv.com/shadowbringers/
and the story section has more details on each of the revealed areas as well as the new trial encounters and tribes.
So the flood of Light was halted, presumably by Minfillia, in Ahm Araeng. Also we can confirm that Ahm Araeng = Thanalan (basically) since its the desert region in the south of Norvrandt. Kholusia is more than likely to be Vylbrandt, and Rak'tika is the Black Shroud. Il Mheg is still debatable but it seems more likely to be Coerthas than it does Dravania , or maybe a combination of the regions. The only question I have is how on earth Ahm Araeng became a desert when on the Source, Thanalan only became one because of the 3rd Calamity, or is Ahm Araeng the Sagolii Desert instead, to which I want to ask if the Sagolii always existed.
The Silvertear Lake equivalent is called the Source... and I'm really thinking we are gonna be climbing out of it at the beginning of ShB. "Hey where did you come from?" "The Source" "Yeah, I saw you climb out of it, but srsly where?"
Rak'tika was once home to great magical empire of Rokan, and I hope these guys replace the Allagans as our endgame currency source, if just for a breath of fresh air.
The regions of the First decimated by the Flood Of Light are collectively known as 'The Empty' fittingly enough. And the raid of Eden is about 'wielding the power of Eden' to return the elements. Which makes it seem like Eden is not just another primal...
I am a bit concerned about the whole "Hero becomes villain as the Warrior of Light embraces the dark" as part of the intro to the story section....
I have more thoughts, but they are still unorganized at this juncture.