Weeks of rumors and speculation have all lead to this, Activision confirmed that Call of Duty: Black Ops IIII will be released on October 12th for PC, Playstation 4, and Xbox One.
More information on the title was not readily available, with a "community reveal event" set for May 17th. Its also safe to assume we can expect to see this game featured heavily at E3 2018 this summer leading up to its eventual fall release.
It is worth noting that this is the first time that a Call of Duty title will release in October other than November in over a decade. It makes one wonder why they would post such a release schedule, perhaps Activision has looked at the impending fall releases (Red Dead Redemption 2, anyone?) and is trying to get ahead of the curve.
Again, Call of Duty: Black Ops IIII releases October 12th, 2018 on Xbox One, PC, and PS4.