MacRumors published a story that Apple has released the second beta of tvOS 17.4 to registered developers.
Apple Seeds Second Beta of tvOS 17.4 to Developers
Apple today seeded the second beta of an upcoming tvOS 17.4 to developers for testing purposes, with the beta coming two weeks after the release of the first tvOS 17.4 beta.
Registered developers are able to download the tvOS 17.4 update by opting in to the beta through the Settings app on the Apple TV. A registered developer account is required.