In the interview with Polygon, Dan Bunting, co studio head of Treyarch, suggests more content is coming for Call of Duty: Black Ops 3.
“[Black Ops 4] is built to be expandable, adaptable, [and] it’s going to evolve over time,” he said. “We’ve gone into this knowing that we’re making a game that can be played with friends across the board and going to be played for a long time to come, many years. We learned that lesson in a big way with Black Ops 3. We didn’t necessarily build Black Ops 3 to be run like that. We just learned, evolved and adapted to run it that way. We’re still not done releasing content for that game.“
Treyarch has been providing support for Black Ops 3, first released in 2015, continuously with new Black Market content, and for the very first time, a DLC 5 Zombies Chronicles that they released in 2017.