George Lucas told everyone he was working on a movie called 'Blue Harvest' when he was really filming Return of the Jedi. What a liar.
James Cameron told everyone he was filming a documentary on icebergs when he was scouting locations for Titanic. What a liar.
Christopher Nolan told everyone he was making a movie called 'Rory's Last Kiss' when he was filming The Dark Knight. What a liar.
Directors who try to conceal their intellectual property in an attempt not to ruin the suprise before films are released in theaters are a bunch of goddamn liars.