I looked to see if this was a topic here and I didn't notice it so I'll add one now. My appologies if this has been discussed in the past.
I'd like to see the WARGAME SERIES by Games Workshop re-made by FFG. These boardgames included BATTLE FOR ARMAGEDDON, THE HORUS HERESY, and DOOM OF THE ELDAR (or TYRANID ATTACK, depending upon which edition you received). These were great little board wargames. FFG would do a great job re-vamping them.
Also, SPACE HULK. FFG is already very familiar with dungeon crawler style games. Why not this one?
DRAGONMASTER would also be a good one to re-print.
CURSE OF THE MUMMY'S TOMB, a boardgame by Steven Hand, original creator of FURY OF DRACULA.
These are my picks. Any others?