Activision sent out the following

 

Black Ops is back! In what represents a game-changing experience, Call of Duty®: Black Ops 4 will revolutionize the top-selling series in Call of Duty® history when it launches worldwide on Friday, October 12 for the PlayStation 4, Xbox One and PC. Call of Duty fans can tune in Thursday, May 17, when publisher Activision, a wholly owned subsidiary of Activision Blizzard (NASDAQ: ATVI), and award-winning developer Treyarch host the community reveal to a worldwide audience.
For more information and the latest intel on Call of Duty: Black Ops 4, check out: www.callofduty.com, www.youtube.com/callofduty and follow @Treyarch and @CallofDuty on Twitter and Instagram and Facebook.
Well this was not unexpected but is still nice to get confirmation. The Call of Duty series is now a staple of modern gaming, and it will be with us for a while stil.
Source: Activision PR