In addition to the release of iOS/iPadOS 16.4 Developer Preview Beta 3 today, Apple also released the tvOS 16.4 Developer Preview Beta 3 update with version number (20L5480g), one week after the last Beta update.
Registered developers can download the tvOS 16.4 update using Xcode by downloading a profile on Apple TV.
tvOS updates are usually secondary, focusing on internal Bug fixes and improvements rather than significant external changes. No significant Beta changes have been seen.
Apple shares some information about the official release of tvOS in its tvOS support documentation, which is updated with each tvOS release.
How do I upgrade iOS/iPadOS/watchOS/macOS Development/Public Beta?
Just download and install the description file to detect the development/public beta upgrade in the system update. See below for how to download the description file.
It should be noted that due to the cache problem of node servers in various regions of Apple, some places may detect a slight delay in the update time, generally within half an hour, not too long.