FFXIII has been pushed back due to development of the White Engine. Actually Microsoft has been funding the development of the White Engine to be multiplatform and Square Enix has been pushing MS for tight terms and lots of money if they are to bring it to the Xbox 360.
As of now, the White Engine is multiplatform...not FFXIII. However MS has been negotiating with SE for about 9 months now and has offered huge sums of money to have FFXIII as well as Versus XIII co-release on the Xbox 360.
Also, there is rumor that Microsoft may look to buy exclusivity and have Square break contract with Sony like they did back in the old days with FFVII and Nintendo.
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