Apple has now seeded the fourth beta of tvOS 10.0.1 to developers. We see this update 10 days after releasing the third build. This is a minor update to tvOS, which means that there are mainly bug fixes and other small improvements.
To get the latest version, developers can go to the Settings app and find it in there. If you don’t have tvOS 10.0.1 yet, you can download it in the Apple Developer Center and install it via iTunes.