The third beta of tvOS 10.0.1 has now been seeded to developers. We see this one week after the last update. In this version we mainly find bug fixes and stability improvements. Other than that, there is nothing major and anything that the user will notice.
To download the latest beta, developers can look under system in the settings app and find it there. If you haven’t yet installed tvOS 10.0.1, you can download the IPSW from Apple’s developer site.