the reason Kojima said MGS4(Metal Gear Solid is a multiplatform franchise, btw) would never come to Microsoft was because of size/hardware limitations: it took a few full 50GB dual layer BD-Roms to watch the entire movies/play the entire game.
the 360 used 8GB dual layer DVD-roms.
now that they have the Xbone using BD-roms with installs... what would stop them from doing a PC port of MGS4 and then doing an HD re-release on the Xbox One since it now uses modified x86 architecture?
sure it'd be a lot of work...but they could make a huge profit.
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MGS4 is already HD. Worst game in the series anyway, you're not missing out on too much. And that's coming from someone whose favourite gaming series is Metal Gear.