MacRumors published a story that Apple has released the first beta of tvOS 16 to registered developers.
Apple Seeds First Beta of tvOS 16 to Developers
Now that the WWDC keynote event is over, Apple has started seeding new software updates to developers. tvOS 16, the newest version of the tvOS operating system for the Apple TV 4K and HD, is now available. tvOS 16 was not previewed at the event, but there is indeed a new beta.
Apple Seeds First Beta of tvOS 16 to Developers
Developers can download the new tvOS 16 beta by downloading a profile onto the Apple TV using Xcode.
