https://wccftech.com/call-of-duty-might-ditch-yearly-schedule-eventually-activision-blizzard-employees-cautiously-optimistic-on-microsoft-deal/

Call of Duty has been on a yearly schedule since the third installment, which launched in 2006, only one year after Call of Duty 2. Ever since that time, it's been one of the very few certainties in the games industry: every new year would invariably feature another entry of the increasingly popular first-person shooter franchise, just like FIFA and other sports titles.

That might change in the future, though. A new Bloomberg report cites discussions at Activision Blizzard's high levels regarding the possibility to ditch the yearly schedule at last. This is seemingly unrelated to Microsoft's proposed acquisition of the company, by the way.