Trisection for me.

It seems to me that the whole story for the FFT raid is going to be done much like Crystal Tower not literally being FFIII's final dungeon but simply referencing it in theme and enemies, it's a grab bag of references from FFT/FFXII (and even FFIX) without being a literal retelling of FFT's storyline (after all, the first part of the raid is going to be a ruined version of Rabanastre from FFXII, a city which did not exist in FFT, so that pretty clearly shows it's not going to be literally 'FFT in Hydaelyn' (after all, SE themselves have long stated the real Ivalice and Hydaelyn are totally separate worlds).

Either way, we'll find out soon enough.