-The battle system is time based, real time
-You map different attacks to the face buttons, there are no menus (like KH but less button mashy)
-You can move freely around in battle, timing is important
-'Overclock' ability lets you slow down time in battle to gain an advantage (wasn't Overclock originally shown with the first FFXIII trailer??)
-Lightning has loads of customization, and her skill selection is reflected by the gear which you have her wear
-The world is all new
-The game is open world, and quest based, not linear
-Different actions burn time in different ways in the world, such as discovering a certain treasure, or making certain decisions
-After 13 days you may be forced into the final battle regardless