The Telegraph has a story on the possible rights sale that examines past wishes from Hollywood players to make The Catcher in the Rye ever since its publication in 1951. Apparently Marlon Brando was once considered to play Holden, even though he was almost 30 when the novel was written? The article also quotes Salinger from long ago as saying that he somewhat expects a posthumous adaptation, because he figured he wouldn't die rich (that doesn't mean he okayed a film to be made after his death, only that he figured it would happen).
I'm not the biggest Catcher fan, but I've read it a few times and always thought a movie version would be pretty boring. Plus, enough ripoffs and Salinger-inspired films have all but rendered an adaptation of the actual book unnecessary. Never mind that it would also be disrespectful to both the author and the character to bring Holden to life. The film will likely have him breaking the fourth wall to even say how much he hates being in it. If it must be done, though, hopefully all producers are aware that only Wes Anderson will be suitable to direct the lousy thing.