Off the top of my head?

Demon's Souls, of the three Souls game FROM released last gen, Demon is the one that really needed to be remastered and released, especially since the servers shut down this year and frankly they were poorly implemented anyway. Dark Souls is a still a fine game and most of the upgrades the remaster gave it are not terribly groundbreaking because the base game is still pretty good. Demon's was a title that was rough around the edges and could have used a graphical facelift, not to mention I can't imagine Sony wouldn't want another Souls-like exclusive for the PS4.

Konami has been updating the Suikoden website recently and while fans brace themselves for either a pachinko machine or mobile title, Konami could do a bit of fan salvaging by releasing a remaster of some of the older entries. A remastered port of the PSP Suikoden I-II would be nice, but even a remaster of any of the PS2 entries would be appreciated, especially since last I checked, SIV and SV never got released for PSN. A collection would be quite nice a la ".hack" variety.

From Squenix, I would love a remaster of either Xenogears or Vagrant Story. For Xenogears, I simply want a new cleaned up translation and maybe new VA work with simple graphical/audio updates that wouldn't need any new character models. VS would be pretty cool as well with a simple remaster. I know the team wanted to work on a remaster like they did for Tactics Ogre.