We already know Sony has pretty much indicated we aren't going to see many PS3 games remastered for the PS4 which is wise in ways but I think they should do a few. That may encourage people hanging onto the PS3 for certain games to take the jump to the PS4. Remastering PS2 games for the PS3 in HD was a financial success for most of the "HD Collection" games but they started with those late in the game.
In addition to a few key remastered PS3 games, Sony would be silly to avoid looking into the PS2 library for rare titles that would sell well.
What games do you guys want to see remastered for the PS4?
Here's my Wishlist (although most are very unlikely):
The .hack series
The Elder Scrolls (Complete Series)
Fallout (Complete Series)
BioShock (Complete Series)
Mass Effect Trilogy