https://wccftech.com/apple-releases-tvos-14-public-beta-heres-how-to-download/

Apple has seen fit to release the first beta of tvOS 14 to public testers. if you are enrolled in Apple's beta testing program, you can download tvOS 14 on your compatible Apple TV models right now.

You can try Apple's upcoming tvOS 14 public beta right now and test out the new changes for yourself. Installing the public beta on your Apple TV model is quite simple. Simply follow the step by step instructions below.