According to The Verge, the Watch ABC and Watch Disney apps now work with Single Sign-on, so customers who have cable through a supported provider can log into those apps automatically without needing to re-enter their cable credentials.
Single Sign-on, for those unfamiliar, is a new feature that allows cable subscribers to log into the Apple TV and iOS devices with their credentials one time, with those credentials then able to authenticate their subscription in all supported apps.
At the current time, Single Sign-on is only available for the following cable providers: CenturyLink, DirecTV, Dish, GVTC, Hawaiian Telcom, GTA, Hotwire, MetroCast, and Sling.
Single Sign-on is also limited to apps that have implemented support for the feature, which is a small list at the current time, limited to channels like Lifetime, NBC, History, Syfy, USA Now, Food Network, and a handful of others.
Now that Single Sign-on is available, additional apps will likely begin implementing support for the service, making it more useful to cable subscribers.
Update: Freeform has also added Single Sign-on support for iOS devices, while FXNOW has added support on tvOS. Disney Channel, Disney Junior, and Disney XD are the three Disney channels that now support Single Sign-on, on both iOS and tvOS.
Service Electric has also been added as a new provider that supports Single Sign-on.