Cool...
Metal Gear Solid Subsistence will be a staggering three-disc set: Subsistence, Persistence, and Existence. Subsistence offers the original Metal Gear Solid 3: Snake Eater (which, if you still haven't played it yet, boasts one of the best, most tensely drawn-out boss battles in video gamedom), in addition to new camo options showcased in a demo theater mode.
Persistence offers the original MSX Metal Gear Solid and Metal Gear 2 from the late '80s, a new boss duel mode, a goofy "secret" theater (offering oddball in-engine comedy movies showcasing the patented weirdness that is Hideo Kojima), and the real snake meat of the package -- namely, the online multiplay.
And even after you've been a good little solider and finished all the snake meat on your plate, Existence will offer a massive desert: A specially edited, remastered, three hour movie of cutscenes comprising MGS3's entire Cold War storyline. No need to continually play (and repeatedly die in) the game to move to the next cinematic; just watch and enjoy.