I'd kind of like a normal level up system, but I did like the new (er old?) set up. Maybe they could do something like, have it so everytime you level you can pick a path to go down? Then again that'd be kind of limiting if the max level were to be 100...
Really I'd like the battle system to stay the same and everything, but it would be nice if they made the game harder but included the ability to heal the leader after they die. Being able to switch who you're playing as during battle would be nice 2.
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All I want out of FFXIII-2 is a slightly more robust battle system, side quests inside towns with an opportunity to visit the inhabitants, a few worthwhile mini games (but not many) and a MUCH more well rounded class-change system so that summons are useful and every fight can be quite fun. Even if there is an airship, I don't mind whether you can control it or not(its always a nice thought though).
I don't ask more then that. I definitely don't want a whole lot in the end, since I found FFXIII to be quite good; and this is just like polishing the quartz crystal.