Hey guys,
Just giving my 10 cents here, plz ignore if useless!
Most of the time, when watching the Trailer, I remembered of Crisis Core mechanics, where you had free movement of the character and selected most of the commands with the shoulder buttons.
The swords thingy resembles the materia seleciton system... you can cycle between them and hit the X button to perform selected action.
What if the swords are diferente attack styles and stuff?
Probably digging deeper into Crisis Core, we can figure out more about the mechanics!
Oh, btw, did someone play Type-0/Agito XIII?
The games started being developed almost at the same time... it would be Worth a shot to take a look at that as well!