The increased file size was "due to the increased amount of content" at launch, including map files for Warzone, as well as the Zombies mode, and the fact that a lot of content from Modern Warfare II carries over to Modern Warfare III.
Activision has moved to explain the enormous file sizes Call of Duty fans can expect to hit their hard-drives with the launch of Modern Warfare 3 this month. With Modern Warfare 3 campaign early access now live, players have found a total Call of Duty install imprint of an eye-watering 234.9GB on PlayStation 5.