Given the time and resources it would take to port MGS4 (which would be more of a restructural programming approach rather than port). I don't think Konami/KojimaPro would see enough profit in bringing this game to the 360/PC by the time it's final, especially since they have a deal in place with Sony for some sort of exclusivity. IMO, it's either 6 month away or never, and i doubt a 360 version of MGS4 would be done in little as 6 months.