Apple today seeded the fifth beta of tvOS 10.2.1 to developers. This comes one and a half weeks after the last seed. We’re not sure what’s new in this version. Since it’s a smaller update it likely contains bug fixes and improvements. Release notes will be more clear one the version is released to the public.
To get this version developers can go to Settings and find it under System. If you’re not on the beta you’ll need to install the IPSW using a Mac and iTunes.