Call Of Duty: WWII Zombies Trailer Gets Leaked, But Devs Ask Fans To Avoid It Heads up, 'Call of Duty' fans: the trailer for 'Call of Duty: WWII Zombies' has leaked, to the disappointment of its developers. Activision and Sledgehammer Games were supposed to unveil the official trailer at this year’s San Diego Comic-Con. by Carl Velasco