https://www.theverge.com/2018/9/12/17843486/apple-tv-tvos-12-update-new-features-release-date

Apple will release tvOS 12 on September 17th, the company announced at WWDC. Back at WWDC, Apple announced it was bringing Dolby Atmos support to the Apple TV, as well as a new zero sign on feature, which is an evolution of single-sign on that has been present on the platform since 2016.

While single sign on required users to input their credentials for their TV provider, zero sign on only requires you to be connected to your provider’s Wi-Fi network in your home (if they support it) and you’ll automatically be logged into apps that require cable logins. Currently the only provider supporting the option is Charter Spectrum, but Apple says more providers will support it in the future.