The new tvOS 10.2.1 Beta 5 is available for both developers and also members of Apple’s public beta testing program.
The update mainly includes performance improvements and bug fixes, you can see the release notes below.
About tvOS 10.2.1
tvOS 10.2 includes includes bug fixes, and security improvements in the OS. Please test your apps with this beta and file bug reports as needed.
Notes and Known Issues
No known issues.
In order to download the new tvOS 10.2.1 Beta 5 software you will either need to be a registered developer of a member of Apple’s public beta testing program.
Source 9 to 5 Mac