Well, I know that they may as well be summons, so far, we've seen none unlike FFXIII.
I'm waiting for more details.

They may go like FF12's Espers and use totally different Summons.
Yet, Ifrit HAS BEEN in every RPG Final Fantasy, except 1&2 original UP TO DATE.
So I'm wondering where he's going to be in this one.
The game seems awfully gloomy for a Fiery Light Summon.