Apple released tvOS 11.2 for Apple TV 4th gen and 4K Apple TV. The update has a new option for 4K Apple TV that changes the dynamic range and frame rate based on the content being displayed.
A new 'Match Content' option is found in the Video & Audio section of tvOS settings, but only on 4K Apple TV. It contains two settings: 'Match Dynamic Range' and 'Match Frame Rate'. The first is responsible for ensuring that all videos are played with their original dynamic range, and the second is with the original frame rate.
In addition, the update contains a new Sports section in the TV app. In it you can watch broadcasts of games and matches.
You can download and install tvOS 11.2 for Apple TV 4K and Apple TV 4th generations through System Preferences -> Software Update.