https://wccftech.com/battle-royale-mode-rumored-to-be-added-to-modern-warfare-in-early-2020-as-a-separate-free-download/

Battle Royale won’t be available for Call of Duty: Modern Warfare’s launch, as the developers at Infinity Ward said they are focused on delivering ‘core multiplayer first.

However, that is not to say Battle Royale is never happening. In fact, content creator LongSensation recently shared a rumor he heard about the mode launching in early 2020 as a free and separate download from the main game.