First - Props to the person that suggested the Conan sequel. I really, really hope the re-launch with Jason Mamoa as Conan does the series justice, but I can't see anyone as Conan besides Arnold. It's a shame that instead of Conan the Conqueror they ended up making Red Sonja with Arnold as "Kalidor" ... decent movie but kinda lame.
This will probably not be well received but, in all honesty, I would like to see Ridley Scott, Russell Crowe and company do a sequel to their new version of Robin Hood. I really enjoyed that movie (as I enjoyed Gladiator and Kingdom of Heaven before it) I know it wasn't a box office success and audiences bitched and moaned about it not being a traditional Robin Hood story (and, honestly, it would have been a better film had they not done multiple script re-writes prior to and during production) but the way they established the characters' backgrounds would lend itself so well to an amazing sequel. Hopefully completed before the cast are all too old (almost there anyway) to attempt it.