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There is an old thread on this forum covering it which I'll find later if you don't encounter it. Someone was translating all the material within it (that's how people know the fal'Cie will be in it or have some relation):
It has a lot more info that this thread doesn't have, but I don't know if some of that stuff is true.
This is compendium is a concise list of pivotal information.
I have purposely left out things like "Noctis companions have other weapons" and "battles will be very intense", because they hardly bring anything useful into the picture.
Not to mention I didn't include speculations like "vertical fights", unless of course you could provide a source for this information
EDIT: ohlol that thread is written by Oji, no wonder then....