This tvOS release cycle adds an developer API called AVDisplayManager for automatic display mode switching and support for the Unwatched category in Home Sharing.
All of the releases come just a few days after the release of the .0 releases of those operating systems.
Thursday’s release accelerates an already accelerated release cycle, as the last developer beta for tvOS 11 hit on Monday of this week.
Along with iOS 11 developer beta 8, macOS High Sierra developer beta 8, Apple released tvOS 11 developer beta 8 (15J5374a) on Monday.
Along with iOS 11 beta 7, macOS High Sierra beta 7, and watchOS 4 beta 7, Apple released tvOS 11 developer beta 7 (XX) on Monday.
Along with iOS 11 beta 6, macOS High Sierra beta 6, and watchOS 4 beta 6, Apple released tvOS 11 developer beta 6 (15J5360b) on Monday.