Call of Duty: Warzone has become the first PlayStation 4 backwards compatible game to support 120hz on PlayStation 5.
Season 4 launched this morning, and buried within the patch notes is word Warzone now has 120hz support for PS5. This requires HDMI 2.1.
It's a surprise but welcome addition, and hopefully heralds similar updates from other PS4 games running in back compat form on PS5.