i would really hope that mgs4 will come to the 360,because first it is like the best espionage ever created it is one of the games that are technically flawless.example gears of war offcourse.and second it is one of the best looking games ever created(well done hideo kojima).hoping your masterpiece comes to the 360.and there is a very big chance it comes to the 360 about 70 precent sice the clues are there an xbox 360 controller on the first image,placed on that teaser site and andrawing of solidsnake,and that does not resemble to mgs5 because mgs4 was the last game which you take the role of solid snakethat is mgs4 and this is another clue or sign of mgs4 coming to the 360.in addition konami won't pay for mgs5 since they didn't win much from mgs4 and they payed tons of money for the project.at last kojima sent another image of which could be 5 or s. a 5 could resemble to mgs5 and the s could resemble to mgs4+oxide for 360(hope it is an s.ps: s could resemble to another game).to show that 360 controller appears in the picture look at the upper right of the imge you'll see it.
good luck. please mgs4 for 360.