A true reboot to the Mechwarrior series, or even Mechwarrior 2, 3, or 4 redone.
Descent is getting an unofficial reboot in UE3 so that is going to be awesome.
Final Fantasy 7.
Halo 1 or 2 redone for the PC.
Zelda Ocarina of Time.
Sports Car GT.
Falcon 4.0.
I would really like to see Nox redone. Not the most popular game but it was pretty ******* at the time.
The first Battle For Middle Earth.
Morrowind.
Descent Freespace.
Stalker series redone in a better engine like 4A.
Supreme Commander redone to take advantage of new CPUs.