Ninja Gaiden Sigma and DMC4 are PS3 exclusive and will remain that way.

Kingdomheart series will come to PS3.

FF7 is rumored to be remade on PS 3 and Chrono Trigger is also rumored to appear on PS3.

Square has been Sony's biggest allly for years, once their games start to kick it, we are going to see a lot more good RPG games.