Call of Duty: Black Ops 4 will have a reveal event on May 17, with the game scheduled to be released worldwide on October 12. Kotaku also did a little digging on the subject and corroborated Polygon's story regarding the single player campaign as well as the Battle Royale rumor.
A battle royale mode in a Call of Duty game has been anticipated by many, though there's some surprise that it'll come so soon. Because of this, it was mentioned that Treyarch made a decision to instead focus on both the multiplayer and the zombies portion of the gameplay, making the cooperative experience more even more emphasized.
Activision's upcoming Call of Duty: Black Ops 4 will not feature a traditional single-player campaign, anonymous sources familiar with the project told Polygon.
Activision is expected to reveal the details on Call of Duty: Black Ops 4 at a reveal event on May 17.
In a separate report, a source close to Charlie Intel has said a Battle Royale mode for Black Ops 4 will "fill the content gap of no campaign". "One source said Treyarch has since focused Black Ops 4's development on expanding multiplayer and the series' popular Zombies mode".
I've reached out to Activision for comment and will update if I receive a reply.
None of this is likely to sound farfetched to most readers but it's worth reiterating we probably won't know for sure until the game's official reveal on May 17th.
This would make Black Ops 4 the first major Call of Duty title to ship without a standard story.