tvOS 10.2 beta 6 (build 14W5264a) can be deployed via the Software Update mechanism on any Apple TV with an appropriate configuration profile. watchOS 3.2 beta 6 (build 14V5245a) is available as an over-the-air download via your paired iPhone.
iOS 10.3 beta 6 (build14E5273a) and macOS Sierra 10.12.4 beta 6 (build 16E189a) both released yesterday to members of the Apple Developer Program.
watchOS 3.2 features
watchOS 3.2 brings Theater Mode to Apple Watch via a new toggle in Control Center which disables the Raise to Wake feature and mutes audible alerts.
According to Apple:
Theater Mode lets users quickly mute the sound on their Apple Watch and avoid waking the screen on wrist raise. Users still receive notifications (including haptics) while in Theater Mode, which they can view by tapping the screen or pressing the Digital Crown.
tvOS 10.2 also includes support for Apple’s Device Enrollment Program, Expanded Mobile Device Management, the VideoToolbox framework and the new Apple File System (also found in betas of iOS 10.3, watchOS 3.2 and macOS Sierra 10.12.4).
iOS and macOS are available for public testing via Apple’s Beta Software Program.