Apple has today released tvOS 15.5.1 and HomePod software 15.5.1.
While we do not currently know what's included in tvOS 15.5.1, Apple's release notes for HomePod software 15.5.1, via MacRumors mentions a fix for an issue that caused music to stop playing after a short time.
As these updates appear to have been released to address a small number of specific issues, our expectation is that they do not contain any accessibility changes for blind and low vision users; however, if you notice any changes, improvements or regressions in your own use of these releases, please post a comment with your findings.
How to update
To install tvOS 15.5.1, on Apple TV 4K or Apple TV HD, go to the Settings channel, then look for the System section near the bottom. From here, look for Software Updates under Maintenance, then select Update Software and Download and Install. Wait for your Apple TV to download the update. Don't disconnect or unplug your Apple TV until the update completes.
More information on how to update the software on your Apple TV is available on this Apple Support page.
By default, HomePod and HomePod mini automatically install new software updates, but you can manually check for updates in the Home app on your iPhone, iPad, iPod touch, or Mac. See this Apple support article for full instructions.