Designed for the fourth-generation Apple TV, the third tvOS 10.1 beta can be obtained by connecting the Apple TV to a computer with a USB-C to USB-A cable, downloading and installing the software from a registered developer account via iTunes or Apple Configurator. Once a beta profile has been installed on the device through iTunes, new beta updates will be available over the air.
Many Apple TV owners are eagerly awaiting a promised Single Sign-On feature that will allow Apple TV users to sign in once with their cable credentials to access all available live cable content, and the feature was introduced in the first tvOS 10.1 beta.
The new "TV" app that was announced at Apple's October 27 event was not included in the first two tvOS 10.1 betas, but it was introduced on iOS devices in the second iOS 10.2 beta, suggesting it could come to tvOS users soon. "TV" is meant to be a TV guide-style app that provides users with recommendations on what to watch and an easy way to discover new television content.
tvOS 10, for those unfamiliar with the operating system, brings features like improved search, expanded Siri capabilities, a dark mode, a Continuity option for using the iPhone for text input, automatic app downloads, quicker access to live TV, and more.
Update: Some users are having difficulty downloading the update, as their systems are reporting that an update is available but are stuck waiting to connect to the update server to download.