Was'nt there this kind of rumour with an article like that a few month ago and that died quite quickly. FFXIII and FFvXIII will NOT go to X360 due to the TGS trailers. MGS4 will NOT go to X360 for atleast a year and even that is IMPROBABLE. My prediction is NEITHER of them will be on X360.
End of 2014 Hardware Predictions (03/03/14)
PlayStation 4: 12-15million
Xbox One: 7-10 million
Wii U: 8-9 million (Changed 01/04/2014 from 7-9 --> 8-9 million)