Good point masamune. While I knew exactly where all of the summons came from, I never thought that deeply about it.

If I were to guess, at least one or two original summons from FFX will make a reappearance, or a boss from FFX (Nemesis as a summon? Bwahaha). But all these FT references are obviously because of the overwhelming influence of members from the FFT developement team. While I am not too fond of FFTA AT ALL, I still like the references, and I think there will most definitely be a few FFT summons.