Apple today released to developers tvOS 15.5 Beta 3 update, version number (19L5562e), for testing purposes, the software was released 7 days after the release of the second beta.
Developers can download the new tvOS 15.5 betas by using Xcode to download the configuration file to Apple TV.
tvOS updates are typically smaller in scale and focus primarily on underlying bug fixes and improvements rather than primarily external-facing changes. So far, we haven’t found new features in tvOS 15.5.