Call of Duty: Black Ops 4 (stylized as Call of Duty: Black Ops IIII) is an upcoming first-person shooter video game developed by Treyarch and published by Activision. It is scheduled to be released worldwide on October 12, 2018, for Microsoft Windows, PlayStation 4 and Xbox One. It is a sequel to the 2015 game Call of Duty: Black Ops III and will be the fifth entry in the Black Ops subseries, and the 15th main installment in the Call of Duty series overall.

Multiplayer
Black Ops 4 Multiplayer features the return of Specialists, unique soldier characters with special abilities and traits. The game features a total of ten Specialists, six of which (Ruin, Prophet, Battery, Seraph, Nomad, Firebreak) are returning characters from Black Ops III, while the other four (Recon, Ajax, Torque, Crash) are new additions.

Multiplayer has also been reworked with various changes for more tactical and teamwork gameplay. Health regeneration is removed in favor of a manual healing system (with each player having a health bar), and weapons are now given predictive recoil patterns. Weapon customization is also emphasized, with specific Operator Mods allowing for deeper personalization of players' weapons.

In addition, the game includes a Solo Missions mode featuring skill-based missions that contain backstories on various Specialists in the game. The missions are set within the same narrative world of the Black Ops campaigns, between the events of Black Ops II and Black Ops III.

Zombies
Zombies returns as the cooperative multiplayer mode for Black Ops 4. The game mode features a wider range of customization, allowing for more personalized play styles. Mechanics of the game can be customized via "Custom Mutations", which include over 100 variables, such as overall difficulty, zombie speed, health, damage, and more. Time-limited events known as "Callings" are also promised to be included in the game for long-term engagement.

Black Ops 4 is also the first game to feature two distinctive, separate storylines for Zombies. At launch, the game features three on-disc maps: "Voyage of Despair", which takes place on the RMS Titanic; "IX", which takes place in an Ancient Rome arena; and "Blood of the Dead", a soft-remake of the Black Ops II map "Mob of the Dead", taking place once more in Alcatraz Federal Penitentiary. The former two maps form the new storyline, and star a new cast of characters: Scarlett, Shaw, Diego and Bruno; while "Blood of the Dead" returns to the previous storyline established in the previous Black Ops games, and stars the four original characters (Dempsey, Nikolai, Takeo, Richtofen; also known collectively as Primis).