The Black Ops segment of the Call of Duty franchise has been led by Treyarch since 2010, and has had a beloved place in the FPS community in large part to their incredibly addictive zombie mode. Both the zombie and multiplayer modes will be expanded compared to past COD games, the sources claim, which leads into today's other leak. Usually Call of Duty games are released in the first week of November, but this year's game has been pushed up to avoid the October 26th release of Rockstar's Red Dead Redemption 2.
Dropping the campaign from Black Ops 4 would be a big change, but not entirely unprecedented. According to a report from Polygon, there will not be a traditional single-player story mode in the game. With Black Ops 4, the series may be embracing the growing trend of online multiplayer shooters like Overwatch, Fortnite, and PUBG. Well, what we know is that these games always included a single-player, so it's hard to ignore that warning. The single-player campaign has felt like more of an afterthought for at least the last few installments. Instead, Treyarch is apparently focusing on expanding the multiplayer element, including the Zombies mode and possibly some new co-op modes.
According to Polygon, sources connected to Black Ops 4 development have stated that progress on the game's single-player wouldn't be complete by the time it launched.
I've reached out to Activision for comment and will update if I receive a reply.