2D thing is true to an extent... Sony is more picky on Technology. (Which is fairly strange, considering their console is the least capable) If the Technology doesn't meet current standards, then You'll have to offer more. SNKP and the KOF / Metal Slug Combo's... And I'm sure SCEA would have never allowed Namco to bring over Namco Museum had the only game been Pac-Man or Dig-Dug or Pole Position or Galaga.

But annother one we will most likely never see, and one that has escaped the press since it was announced like 3 years ago, Ghouls 'n Ghosts / Ghosts 'n Goblins Online (for PC and GameCube... at the time)