A recent datamine of Call of Duty: Modern Warfare has revealed a host of new details regarding a battle royale mode.
The Modern Warfare subreddit revealed (via Eurogamer) revealed a bunch of new maps and game modes, including battle royale. The images were taken down, but Eurogamer managed to capture some before they were removed.
New zones and other POIs were revealed as well, in addition to new perks and killstreaks. In essence, a lot of new information was revealed in the datamine, and given that the previous entry in the franchise, Black Ops 4, included a battle royale mode, chances are likely that Modern Warfare will include one as well.