9to5Mac published a story that Apple has released the first beta of tvOS 15 to registered developers.

Apple releases first beta of tvOS 15 to developers

Following the WWDC 2021 opening keynote earlier today, Apple has now released the first developer beta of tvOS 15. The update brings some great enhancements for Apple TV users, such as Spatial Audio for first-time AirPods users and FaceTime SharePlay. SharePlay is a new FaceTime feature for sharing content during FaceTime calls, including screen sharing.

Apple releases first beta of tvOS 15 to developers - 9to5Mac