tvOS 12 for Apple TV (fourth-gen) and Apple TV 4K is officially out of beta and available for all users. The annual software update for Apple TV brings support for Dolby Atmos audio for movies on iTunes and other apps, screensaver details like location information, and a new zero sign-on feature for Spectrum TV and Internet customers (more providers coming in the future).
Zero sign-on automatically authenticates watch anywhere video apps from networks based on your Internet provider without the need to log in even once. Dolby Atmos brings support for more immersive audio from supported speakers and receivers; iTunes is automatically upgrading supported movies for free. This makes Apple TV the only streaming box with both Dolby Vision and Dolby Atmos support.