I think they are the four crystal warriors / four warriors of light O_O There.. I said it.
I do think you're right O_O I meant in the trailer, there was a scene where all four of them get together fighting some enemies. We are all just side-characters/"NPCs" and we don't even know it!
yeup.. I wrote this in another thread. There are multiple references to earlier FF games. A big empire (possibly evil?), A force of nature no one can control (the dragons) and then there is of course the crystals (aerethyte)and the lifestream (aerethyte stream). If we draw conclusions based on previous Final Fantasy story lines, the crystal warriors fit right in.
these themes occur in : FF4, FF5, FF6, FF7, FF10, FF12 and FF13.
FFXI 2003-2007: Elaron ~Phoenix
FFXIV 2010-> : Gus Morgan ~Wutai