At first I was thinking Twisted Metal, Crash Bandicoot or Jak as big Sony franchises yet to see a PS3 title.
But we know Twisted Metal has already been hinted at and I wouldn't say that the vast majority of gamers would play that due to level of violence and twisted characters. Crash Bandicoot would fit the any gamer would like it description much more, even though it was mostly aimed at younger teen audiences. And Jak wouldn't cause the same frenzy that another playstation game does... FF VII.
I have a strong feeling its the Final Fantasy VII remake. So many fans still really want this to happen. People have been clamoring for it since the 2005 TGS tech demo and if its anything like the tech demo it would be a massive upgrade over the PS1 installment. And the excellent sales of the PSN download might have re-opened the discussion at SquareEnix over on the remake. Thats my best guess.
