who knows right now. every other rumor that came with that 'platinum working on rising' rumor turned out wrong, and during the konami thing, they were coy and just said rising would be in 2012, and kojima kinda denied it. but maybe?
good news for MGS3 on the HD collection is that it will be 60 fps (MGS2 was already 60 fps). Porting is done by the group that worked on the the God of War HD games.
and MGS2, MGS3 and ZoE2 are all the special/later editions. So, Substance, Subsistence, and Anubis (I have no idea what this last one is)
some people on gaf brought up the whole mgs theme controversy, which would mean the main theme would be replaced for these remakes (and MGS3 on the 3DS).