Final Fantasy XIII Will Not Be Compromised.

Playstation 3 uses Blu-Rays. There is a massive difference in the amount of space the media can contain. Final Fantasy XIII was being developed specifically for the PS3. Now it's coming out on the XBOX 360, people are worried things are going to be cut from the game so it can fit on a DVD. There's "no chance" of that happening according to Square Enix.
[quote]
“The team is targeting to create an equal experience on both the 360 and the PS3, so there are no limitations. For example, right now we’re working on the PS3 version first, and once we’ve completed that we’ll really know how much game there will be to fit onto the Xbox 360 discs.

“So we don’t know how many discs it’ll be housed on for 360, but there won’t be a chance that we’ll compromise anything because, oh it didn’t fit in the 360 discs so we’ll have to take it out of the PS3 version, or vice versa.”</blockquote>

Square Enix are fairly clever developers. We assume they know there would be hell to pay if there was any sniff of content being cut from FFXIII in order to fit it on the XBOX 360.