"Answers" the opera/music from the "End of an Era" video (the prolouge of V1 getting blasted by Bahmut) was an Uematsu peice, i think he came back and did that anyway - also to be fair The Crystal Theme (title/start screen) and the FF Anthem are his works too.
I really hope he does come back to Square for XIV and XV in the future (hint: SE please throw as much money as he wants at him, you know he's worth it! )