Apple recently released the fourth beta of tvOS 14.2 update for developers. The update adds more new features to the tvOS 14 and is currently in the testing process. It comes after one week of rolling out the third beta to developers.
There were no major changes or features added in the previous betas of tvOS 14.2. The tvOS updates other than major updates are usually minor in size. These update only brings some bug fixes and improvements to the tvOS.
The update is available for the developer and can be downloaded into the Apple TV through a profile installed using Xcode.
There is no information available for the tvOS updates which are currently in the beta testing process. tvOS 14 brings many new features to the Apple TV such as the picture-in-picture, new AirPods features, Home control, support for 4K video streaming, and many more.
More on tvOS 14: Apple seeded tvOS 14.0.2 update with bug fixes