Will the 360 version be on multiple discs?

I can't help but wonder if FFXIII could've been so much more if they'd kept it exclusive to the PS3, and developed the game with only Blu-ray disc in mind. Although SE will deny it (for fear of souring their newfound business relationship with M$), compromises have to be made to account for the DVD storage of the 360, and the lack of standard hard disk in each 360 unit.

Also, why are the PS3 and 360 worldwide versions releasing simultaneously? Surely, localizing the PS3 version shouldn't take as much time as porting the game to the 360?

Seems to me like M$ paid SE money both for making a 360 version AND for delaying the PS3 international version just so both versions could be released at the same time.