Since Call of Duty: Advanced Warfare, Activision has split the Call of Duty franchise between three different studios - Infinity Ward, Treyarch, and Sledgehammer Games. This gives each entry in the series a three-year development cycle, which in theory results in better, more fully-featured games. However, a report earlier this year indicated that 2020's Call of Duty would no longer be developed solely by Sledgehammer Games, with Treyarch having to step in and develop the game with just a two year development cycle.
According to reports, this was due to the inability of Sledgehammer Games and Raven Software to agree what to do with the project. However, a new rumor claims that Treyarch stepping in to be the lead developer on Call of Duty 2020 hasn't necessarily resulted in a smoother development process.
This rumor comes from YouTuber TheGamingRevolution, who is known for his Call of Duty leaks - some of which have been proven accurate. According to TheGamingRevolution, Call of Duty 2020's current state is "3/10" and the game will be called either Black Ops 5, Black Ops, or have some other Black Ops-themed name.
“Current state is 3/10. It’s name is still being thrown around between “BO5” and “Black Ops” or another Black Ops themed name.” https://t.co/dl1ngHUaDd— TheGamingRevolution (@TheGamingRevoYT) October 5, 2019
It should be noted that nothing official about Call of Duty 2020 has come from Activision or Treyarch. However, credible reports have indicated that Black Ops 5 will be set during the Cold War, presumably taking place in Vietnam. However, a different rumor has claimed that the Black Ops 5 campaign will be a bit more ambitious and take place over a span of 40 years.
This rumor claims that Black Ops 5 will cover the entirety of the Cold War, featuring both the Korean War and Vietnam War as settings. Perhaps even more notably, the same rumor says that Call of Duty: Black Ops 5 will be more gruesome than Modern Warfare, which has already been making headlines and drumming up controversy for its extreme level of violence.
Fans should take this information with a grain of salt. Call of Duty: Modern Warfare has yet to launch, so there's still a long way to go until Black Ops 5, though a reveal should come sometime in May 2020.
Call of Duty: Black Ops 5 is rumored to be in development for release in 2020.