https://www.techradar.com/news/5-big-changes-that-are-coming-in-call-of-duty-black-ops-4

Like your birthday and Tax Day, every year you can count on the release of a brand new Call of Duty game. 

Just before the annual rush that is E3, Activision and Treyarch games hosted a community livestream event in Los Angeles which confirmed that this year’s release will be called Call of Duty: Black Ops 4 (or IIII if you’re using the official style and hate shorthand Roman numerals).