The producer of FFXIII told a Japanese magazine Dengeki PlayStation 3, he thinks the game will use 100% of the PS3's power. Just like FF7 did for the PS1 and FFX did for the PS2. He also added that there will be no disc swapping issue. The Xbox 360 version will definitely suffer from it. I'm guessing there maybe 5 or 6 discs in total. However, the PS3 version, 1 Blu-ray disc, no swapping. The game development is going well and they are just finishing up the tail end of the development.