Benedict Cumberbatch was supposed to play folk singer Pete Seeger in James Mangold’s Bob Dylan biopic, “A Complete Unknown.” He’s now been replaced by Edward Norton who joins a cast that already includes Timothée Chalamet, Elle Fanning, Boyd Holbrook, Monica Barbaro and Nick Offerman. Jay Cocks (Gangs of New York) wrote the screenplay for the film which is set to now shoot in the summer.