It doesn't make a lot of sense to launch without a single-player mode when the Black Ops series has traditionally had one of the more lauded storylines in the Call of Duty franchise.
Per Polygon's Chris Plante, Call of Duty: Black Ops 4 won't include a traditional single-player campaign mode with more focus being placed on the multiplayer modes and the zombie mode first introduced in 2009. They claim that they've heard from a source as well, and that source is saying that a Battle Royale Mode is coming to Call of Duty: Black IIII. Every Call of Duty game since Call of Duty's start in 2003 has had a story line. Activision has kept their cards held close though, not offering a comment to Polygon beyond that they're looking forward to revealing the game on May 17. Because of this, it was mentioned that Treyarch chose to instead focus on both the multiplayer and the zombies portion of the gameplay, making the cooperative experience more even more emphasized.
According to anonymous sources who spoke to Polygon and CharlieIntel have both claimed that instead of the usual single-player campaign, the Black Ops 4 Battle Royale mode will accompany the usual multiplayer and zombie modes.More news: Twitter reacts to announcer using racially insensitive phrase describing Russell Westbrook
More news: White House mulling more sanctions on Russian Federation over chemical attacks in Syria
More news: Sebastian Vettel: No intention to hold Verstappen back
However, that's not what the rumor stated, and until we hear more, I'm going to assume this is something we should all swallow with a grain of salt.
Call of Duty Black Ops 4 releases on October 12, 2018.
Today's report is unlikely to be confirmed until Activision reveals Black Ops 4 next month.