Sony is talking with Marvel right now on the possibility of bringing the comic character Killraven to the big screen. According to Variety through Coming Soon:

Set in a future where mankind has been enslaved by an alien race, storyline follows a man who, though born in captivity, rises through gladiatorial battles to become the leader of a group of revolutionaries. Called the Freemen, his warrior-slaves unite in an attempt to drive the invaders off the Earth.

The trade adds that Sony already is in discussions with Pulitzer Prize-winning playwright Robert Schenkkan ("The Kentucky Cycle") to adapt the 1970s comic book series.

Marvel would have quite a hand in the production, and that crazy guy Avi Arad would be producing...oh dear lord, he sounded like a car salesman at that Marvel meeting we reported on before. Still the story seems interesting, although it does make me think more of a Riddick plot than anything, or is it the next Neo, or... Anyway, it does sound...(insert usual pre-scripting caveat).

As an aside, here's the update on Arad's production schedule courtesy of IMDB:

Iron Fist (2006) (in production) (executive producer)
Sub-Mariner (2006) (announced) (executive producer)
The Hands of Shang-Chi (2005) (announced) (producer)
Werewolf by Night (2005) (announced) (producer)
The Black Widow (2006) (announced) (co-producer)
Deathlok (2006) (announced) (producer)
Iron Man (2006) (pre-production) (producer)
X-Men 3 (2006) (pre-production) (executive producer)
Man-Thing (2005) (pre-production) (producer)
Luke Cage (2006) (pre-production) (executive producer)
Ghost Rider (2006) (filming) (producer)
Fantastic Four (2005) (post-production) (producer)