Liam Neeson has signed to star in Dark Castle/Warner Bros’ upcoming thriller “Unknown White Male.” Jaume Collet-Serra (“Orphan”) is directing, with Joel Silver producing. “Unknown White Male,” written by Karl Gajdusek, follows a doctor visiting Berlin with his wife, when he is in a car accident and finds himself in a coma. When he finally does wake up, he finds out that he has been replaced in life by another man with a mysterious plan, and he must scramble to find out who this man is, and what he wants. Shooting is due to begin January 2010 in Berlin. Stay tuned for more on “Unknown White Male” right here at…