Activision has followed the same format for Call of Duty DLC since…well, forever. Typically they announce add-ons ahead of time, which are comprised of a handful of maps and a zombie pack, then that date comes and whatever publisher has timed exclusivity rights at that moment gets it a month early. You could either buy that DLC piecemeal or spring for the season pass. In later years, the publisher added small incentives to the pass to sweeten the deal.
That’s all changed now that battle royale (Blackout) is in the mix. Now you need to buy the season pass and stuff is kind of just sprung on us randomly, like this week’s DLC drop of two traditional maps, a zombies story and Blackout cosmetics.
As usual, the zombies mode is the crown jewel of the pass so far.
Source: Destructoid For the first time in forever Call of Duty DLC is handled differently, starting with Black Ops 4