https://www.gamespot.com/articles/e3-2018-black-ops-4-changes-how-dlc-works-in-call-/1100-6459727/

Call of Duty: Black Ops 4 is changing up how the Call of Duty franchise releases DLC. Announced today was the Black Ops pass, which Activision says "represents a new approach to post-launch content." Specifically, this will take the form of a "live season" instead of four separate DLC expansion releases as the franchise is known for. What this means is Activision will release content faster to "keep things fresh" and launch new maps and content faster than before.

The Black Ops Pass for Black Ops 4 includes content for the game's three modes: Zombies, Multiplayer, and the battle royale mode Blackout. This takes the form of: