I know everyone says that their are tons of rumours but absolutly NONE of them have been confirmed. But The same was for Bioshock. The point is, of course they won't confirm that its coming to the Xbox 360 cause that would pretty much void the timed exclusive that it could be. They couldn't confirm that Bioshock was coming to the PS3 right away cause that would make people not buy it for xbox 360. So don't rule out that MGS4 is not coming to Xbox 360, It could very well happen.