[quote name='Sir_Fragalot']Did they enhance the battle system of this game in any way? My problem with the first game was the battle system which I disliked but I loved everything else about the first game.[/QUOTE]
The battle system's gone through some pretty hefty changes, from what I can tell. The AI is still dodgy bullshit though, but it wasn't too tough on Arcade Hard mode. Then again, I was playing as Sephiroth, who I got to lv 99 in Dissidia 1, haha.
Battle System Changes:
Assists added. Can either use for attack or to break out of an enemy's attack. You can setup combos between you and your assist. (Attack them with a bravery to get them to dodge, Bravery Assist to hit them, then smack them with an HP attack).
Rush mode shortened significantly. Harder to dodge HP attacks.
Unable to combo on wall bounce, except with assists.
EX Mode Changed. Now can be used to either attack with an ultimate or to Burst through an enemy's attack. If used defensively, slows down time and lets you open up on them, but does not let you ultimate.
You can still cancel an attack into EX Mode and ultimate, though.
Air time reduced. SE's said they want players to be on the ground more, but air combat's still a huge part of the game.
That's just from observation playing through Prologus.