I do not think Saints Row 3 will be one of the permanent replacements for one of the flagship games of LBP2, Infamous 2, and R&C All4One. Feels more like a temporary one. We also get 3 psn/ps3 each month normally anyways and we are currently at 3. I would expect 3m not just 2, new unrevealed games to be announced next week to replace the current 3 flagship titles. My guess would be Uncharted 3, LBP Karting, and PSASBR. Twisted Metal would also be a possibility. I think we may get one or two of these titles but think we will get surprised by the other one.
PSASBR - already own it, so I hope not, but it would make a good candidate if they include the PS3 and Vita versions.
GoW 3 or GoW Saga - I'd give it a 5% chance that Ascension is given...it's more likely one of these.
Uncharted 3 - Along with GoW, classic Sony-exclusive franchises...seem like the two likely franchise candidates to replace InF2 and LBP2.
What I think Sony should do, but won't, is replace those titles with Vita games, not PS3 games. They need to push Vita sales, not PS3, especially with the PS4 coming out. So PSASBR still works, but do these instead:
LBP Vita - LBP 2 out, this in. Makes sense.
MGS HD Collection - EU already got it.
The Top Five First-Party Vita Exclusives That Have to Happen
The Top Five Third-Party Vita Exclusives That Have to Happen
I could also see Sly Cooper Thieves in Time, littlebigplanet karting and motorstorm apocalypse. (All pretty good games imo, I haven't played a lot of motorstorm though just came with the ps display I bought.)
I'd like to see modnation on there for free though instead of LBP karting but I have serious doubts that they'd make it free over LBP:K, twisted metal would also be great.