Activision has gone to court to find out who let the CoD out of the bag.
As reported by TorrentFreak, last week the US District Court for the Norther District of California granted the publisher's request to subpoena Reddit for the identity of a user who posted a screenshot to the Modern Warfare Reddit forum saying, "I found this image online. Not sure what it is. Possibly Battle Royale." The image featured a number of soldiers standing atop a crashed helicopter in an urban setting, with the words "Call of Duty: Warzone" featured prominently.