Black ops Cold War + Warzone + Modern Warzone = One Ranking System.

[Ghost 141]

Prestige mode is back, but its seasonal but used across 3 games.

Details of the new system.
The Future of Call of Duty®: Warzone™: Continuous Support For Modern Warfare and Black Ops Cold War

https://www.callofduty.com/blog/2020/11/The-Future-of-Call-of-Duty-Warzone-1

Nuke Town returns as Nuke Town 84