Ok, from seeing the famitsu screens from JF 08. I was looking at the gameplay screens for Terra, and I think I figured out, possibly, what the battle system is like. If you notice on his command menu, there is 4 commands. I also see Triangle and O. Maybe, you learn a whole set of abilities, and set them to the Triangle, X, O, Square buttons (Similar to shortcut menu). Then you create combos by pressing the four buttons in a certain order (Like Valkyrie Profile).