no idea on the materia the footage is extremely short, maybe 5 seconds at best. It only showed in battle footage, rest was FMV's.
It looks like they adopting a lightning returns and crisis core hybrid system.
With it been real time battle, I cannot see how certian skills such as counter and auto ability will work out, which sadly suggests the game mechanics will lose a lot of depth for sake of real time action to appease casual gamers.
Square Enix seem to think most people want the remake for the story, not the gameplay.