It's going to be interesting which games are going to replace Infamous 2 and LBP2 since both are rather "big" first party titles. So the replacements have to be the same caliber for staying a whole year on PS+. My guess would be Uncharted 2 and a non-shooter first party game (Heavy Rain, God of War 3, Ratchet and Clank: A Crack in Time) or Killzone 2 / 3 and a non-shooter.
Both inFamous 2 and LittleBigPlanet 2 were only a year old when they come to PSN+. So I expect 2 games that are only a year old to be the new PSN+ games. If I had to guess it would be Twisted Metal (already on PSN and only a year old) and Killzone 3 (to promote Mercenery and Shadowfall).
Here are all the Sony published games that are on PSN
LittleBigPlanet Karting
PS Battle Royal Allstars
Sly Cooper: Thieves in Time
God of War Collection
Twisted Metal
Uncharted 2
Uncharted 3
God of War Origins Collection
Team ICO HD Collection HD
Jak HD Trilogy
Sly HD Trilogy
Ratchet HD Trilogy
Killzone 3 Multiplayer
Starhawk Multiplayer Mode
MotorStorm Apocalypse (already on PSN+)
inFamous 2 (already was on PSN+)
LittleBigPlanet 2 (already was on PSN+)
Ratchet All 4 One (already was on PSN+)
Starhawk Singleplayer (already was on PSN+)
God of War HD (already was on PSN+)
Notable games that are not on PSN (they still can add these, look at Demon Souls as an example)
Killzone 3 (singleplayer)
Resistance 3
Heavy Rain
Ratchet and Clank: A Crack in Time
God of War 3
God of War Ascension