MGS4 becomes "Greatest Hits" but where is MGS 4: "Sub-..."?

Keith @ Gamingvice.net writes:

"Last years summer blockbuster for the PS3, "Metal Gear Solid 4: Guns of the Patriots" is now part of the "Greatest Hits" collection. But the problem here is that it doesn't add anything new to the game at all, except a red box.

My point is that every past Metal Gear game has been rehashed with loads of new content in its newly titled, "MGS: Sub-…", so why hasn't this been done with the latest entry?"