Apple today seeded the second beta of tvOS 10.0.1, Build 14U66, to developers for testing purposes, two weeks after releasing the first tvOS 10.0.1 beta and three weeks after releasing the tvOS 10 update.
Designed for the fourth-generation Apple TV, tvOS 10.0.1 can be installed by connecting the Apple TV to a computer with a USB-C to USB-A cable, downloading and installing the software 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.
No obvious outward-facing features were discovered in the tvOS 10.0.1 beta, so it's likely it focuses on bug fixes and under-the-hood performance improvements to address issues discovered since the release of the first version of tvOS 10.
Single sign-on, a feature that will allow Apple TV users to sign in once with their cable credentials to access all live cable content included in a cable subscription, does not appear to be in this beta and will be introduced in the future.
tvOS 10 brings improved search, expanded Siri capabilities, a new dark mode, a Continuity option for using the iPhone for text input, automatic download of universal apps, easy access to live TV, and more.