In theory, quite a few (done
purely as a HD texture makeover with identical gameplay):-
Frontier: Elite 2
Giants: Citizens Kabuto
Gothic 1-2 (minus all the bugs and unfinished sections!)
Lemmings 2
Medal of Honor: Allied Assault
Morrowind (redone on the Skyrim engine, maybe some of the worst pre-Oblivion annoyances removed)
No One Lives Forever 1 & 2
Operation Flashpoint: Cold War Crisis (the original, before it got ARMA'd)
Syberia 1 & 2
System Shock 1 & 2
The Longest Journey
In practice, none, as I know full well many will fail to resist the temptation to turn them into reboots and will end up changing the gameplay on many of them
"for the casual audience", "optimized for controllers" / "built on engines optimized for lowest common denominator cross platform consoles / tablets", etc. So far the best "remasters" I've seen come from amateur modders who keep it "true to form", not from studio's who are now staffed with very different personnel than those who originally wrote them 12-20 years ago, with a different primary target market (consoles first) vs the Golden Era of PC exclusives:-
Doom / Heretic / Hexen at 4K (
Doomsday Engine):-
http://www.gaming-zone.net/wp-content/uploads/2014/09/doom1-ultimate-004.png
Thief 1&2 in HD :-
http://media.moddb.com/images/mods/1/20/19999/thief_2013-10-07_19-55-45-65.jpg
http://www.moddb.com/mods/thief-gold-hd-texture-mod/
http://www.moddb.com/mods/thief-2-hd-texture-mod
Deus Ex Revision:-
http://www.dx-revision.com
Diablo 2 in widescreen:-
http://wallpaper.pickywallpapers.com/1920x1080/diablo-2-rogue-camp-act-1.jpg
etc. The only ones I would totally redo would be original System Shock (simply because it's so old it lacks mouse-look), and maybe some of the "problem era" DirectDraw / DirectX 5-7 games that are both too new to run under DosBox and yet old enough to suffer from renderer problems / glitches on modern GFX cards / drivers that often struggle with anything under DX7-8. Many games listed are actually entirely playable with a patch / tweak or two, even in widescreen.
I was going to add some ScummVM games (Sam & Max Hit The Road, Day Of The Tentacle, etc), but they actually have that certain LucasArts charm as they are, and don't look too bad with HQ3x upscaling. What worked for Leisure Suit Larry Reloaded, may not work for all such games if they change the art style / voices too much. Grim Fandango needed an update far more than older 2D titles due to the horrendous effort it took to get the GrimE engine running on modern PC's vs the far simpler SCUMMVM 2D titles.
tl:dr - Would love to see better texture / renderer / higher mesh remasters of many games, but after the walking train wreck of Thief 4, have been left with a sour taste regarding "overly helpful" devs who love to steer gameplay in all the wrong directions whilst trying to force every game to be everything to everyone and nerfed to fit a controller.