In addition to iOS 14, iPadOS 14, watchOS 7, there is also an official version of tvOS 14 software.
List of TV starters on which you can install tvOS 14:
- Apple TV 4th generation / Apple TV HD
- Apple TV 4K
To install the latest system, go to Settings, System, Upgrades and then select Update Software. After a while, you should see information about the new version and then just download and install it.
On tvOS 14, new features include 4K support on YouTube, Picture-in-picture mode, multi-user support on Apple Arcade, Home application, audio sharing, support for additional controllers, control center, and wider support for HomeKit. Support for Apple Fitness+ and Apple One will be added this year.