tvOS betas are harder to install than beta updates for iOS and OS X. Installing the tvOS beta requires the Apple TV to be connected to a computer with a USB-C to USB-A cable, with the software downloaded and installed 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.
tvOS 10 builds on features initially introduced with tvOS last October, bringing expanded Siri capabilities like topic-based search, Live Tune-In for automatically accessing live channels, and options for managing HomeKit accessories.
Single-Sign On allows users to sign in and authenticate cable credentials just once instead of requiring authentication in all cable-supported apps, games are now able to require controllers, and there are new features for Photos and Music.
A dark mode offers a better visual experience for darker rooms, universal apps are automatically downloaded, and there's a new Apple TV remote for iOS devices that mirrors the Siri Remote.
Over the beta testing period, Apple has been making slight tweaks and updates to the tvOS 10 operating system, but many of the changes are under-the-hood and not readily apparent to testers. Any outward-facing changes discovered in the sixth beta will be noted below.
For a full overview of all of the new features in tvOS 10, make sure to check out our tvOS 10 roundup.