I'm enjoying the shit out of my new PS3, and almost fucking cried my eyes out when I got to Shadow Moses in MGS4, largely because it started playing the end theme to the first game. As awesome as it would be, however, I really really doubt MGS4 is coming to the 360 any time soon. They said they were going to make trophies for MGS4, and that hasn't happened yet. Not that it's a bad idea, but I doubt it's going to happen so much that I'm sure that gay rights will be allowed in Texas in the next three four eight sixteen years before it happens. FFXII is a fucking long game, and MGS4 was shorter, but there was a hell of a lot more in it, plus the tons of cutscenes, it may have to be at least just two discs. Hell, MGS4 had to install before the game, and in between each Act.
As for not including MGS1, i'm with Holk on this one. There's hardly much room for improvement due to its looks, while MGS2 and MGS3 are still looking not bad, bearing that Snake Eater was meant to be on the PS3 anyway. On top of that, there were The Twin Snakes and MGS1 is available as a PSOne Classic on the Playstation Store, in which it can be scaled to fullscreen without artifacts or too bad of an appearance.