I want something completely new,a character system that doesn't remind me of previous FF's.

I would like to see a system,where your character (or party) development are based on in-game actions you choose for these characters...
For example the answers at questions npc's are asking you could help develop the personality and "job" of each character.
I would love to be able to create the personalities of my group and make them go down a path where i will not be able to know how they will end up.
Just like real life where we don't know how people will end up right from the start...This could also help to have multiple story endings.

FFXIII will be on PS3,a very powerful machine and i really hope it's developers will not focus only on pretty graphics but also aim for a fully developed world where environments,npc's and other aspects could trully affect the way your party and the story developes.