User blog comment:AntiScootaTwo/Advanced Warfare Multiplayer Reveal Trailer released/@comment-82.43.246.124-20140814173330/@comment-1187559-20140815141025

Also, why would Sledgehammer make a Zombies mode when that's Treyarchs thing? As much as people like Zombies you can bet if they added it everyone would just complain they stole it from Treyarch. Whatever mode they add will likely be unique to them.