About the film: On the eve of an annual weekend getaway with friends, John Tanner is being visited by a reporter who tells him his friends aren't who he thinks they are. When the reporter turns up dead, Tanner gets caught in downward spiral of doubt and paranoia and, ultimately, a desperate fight to stay alive long enough to figure out who he can trust and who's out to kill him.
Project Timeline:
May 8, 2007:
Project announced. Director: Simon Kinberg, Distributor: Summit Entertainment
July 15, 2010:
Director: Robert Schwentke (replacing Simon Kinberg)
AFAICT you've covered all the bases with this anwser!