Iron Man writers Art Marcum and Matt Holloway were hired previously to pen a script for an Alien Nation remake.
Patinkin played the alien, while Caan played a human cop with some serious prejudices against his new partner.
Alien Nation originally starred Mandy Patinkin and James Caan as police officers in a future where an alien race had come to earth and had integrated among humanity.
It appears that whatever work they have done is being discarded and the movie is starting from scratch.