MacRumors published a story that Apple has released the sixth beta of tvOS 14 to registered developers.
Apple Seeds Sixth Beta of tvOS 14 to Developers
Apple today seeded the sixth beta of an upcoming tvOS 14 update to developers for testing purposes. Designed for the fourth and fifth-generation Apple TV models, the new ‌tvOS 14‌ beta comes one week after the release of the fifth beta.
Apple Seeds Sixth Beta of tvOS 14 to Developers