Zack Sharf Digital News Director James Gunn has written the script for his upcoming “Superman: Legacy” and is currently putting together a casting list and audition material. He’s also about to embark on a worldwide press tour for his final movie in the Marvel Cinematic Universe, “Guardians of the Galaxy Vol. 3.” The writer-director recently told Rolling Stone that his “Superman” movie isn’t going to feel like a “Guardians” movie. “I learned so much from making these movies,” Gunn said about his Marvel franchise. “But it’s not like ‘Superman’ is going to have exactly the same vibe as a ‘Guardians’ movie. It’s actually quite different.” What the tone of Gunn’s “Superman: Legacy” will be remains to be seen. The tentpole is focusing on a younger iteration of the superhero than the one last seen on the big screen played by Henry Cavill. After his “Guardians Vol. 3” press duties are over, Gunn will transition full time to his new gig as the co-head of DC Studios with Peter Safran. “Superman: Legacy” will kick off the duo’s new DC Universe, which will also include films featuring Supergirl and Batman and Robin.