FF XV will certainly be an open (or semi open) world game, due to story driven stuff being done to death this gen and open world games' popularity like skyrim skyrocketing. So traditional ATM is unlikely.
I'm a huge fan of FF XII, ADB and the gambit system. Just like they tried to make an evolved version of FF X's ATM with FF XIII's battle system, it is a possibility that they will likewise try to make built upon FF XII's battle system with FF XV.







