I think FFXIII would be perfect if:
The story was as mature as FFXII, but a lot more interesting (i.e. actual character development)
A mix between FFXIIs and previous battle systems. I dont want automated battling, but ive also grown tired of the 'shhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhrum - dededadadededada' oh look its a battle....
NO STARWARS MUSIC! AND GET RID OF THE CLONETROOPERS!
Seriously, the music from the trailers reminds me way too much of FFXII and star wars. FFXIIs music wasnt bad or anything, but it was always only background music, it never really satisfied anything.