Alongside the first developer beta iOS 11.2, Apple also released the first beta of tvOS 11.2. The biggest change here includes support for automatically switching the output of the video based on the content. Developers also can take advantage of this with the introduction of AVDisplayManager.
tvOS 11.2
tvOS 11.2 enables automatic frame rate and dynamic range switching on Apple TV 4K
Aside from new betas of iOS 11.2 and watchOS 4.2, Apple today also issued the first beta of the upcoming tvOS 11.2 software update for the fourth-generation Apple TV and newer.
First iOS 11.2, tvOS 11.2 & watchOS 4.2 betas now available for developer testing
Although the upcoming iOS 11.1 software update is still in testing, Apple on Monday issued the all-new iOS 11.2, tvOS 11.2 and watchOS 4.2 betas to its registered developers and members of the paid Apple Developer Program.