Alongside iOS 9.3.2 beta 3 yesterday, today Apple seeded tvOS 9.2.1 beta 3 to developers. This comes a week after the last release. And just like iOS 9.3.2, we expect this to be a fairly minor release with under the hood changes. We’re also currently not sure what’s new with this beta specifically.
To get this version developers can go to the Settings app > System > tvOS 9.2.1.