http://www.nypost.com/p/news/national/nick_cassavetes_out_as_gotti_director_PAw0YhMGxHNZYt1JtgnP3N

"Director Nick Cassavetes has been released from his contract to make the mob flick "due to scheduling conflicts" with another movie, it was reported today."

So all we know now is it won't be him or Stallone.

http://www.thewrap.com/movies/column-post/gotti-stallone-stop-messing-my-bio-pic-23275?page=0,0