Apple on Wednesday released tvOS 15.5.1, a minor update to the tvOS 15 operating system launched in September 2021. tvOS 15.5.1 release arrives some 10 days after the launch of tvOS 15.5.

vOS 15.5.1 can be downloaded over the air on the Apple TV through the Settings app by going to System > Software Update. Apple TV owners who have automatic software updates enabled will be upgraded to tvOS 15.5.1 automatically.
Apple’s tvOS updates are typically more minor in scale, focusing on under-the-hood bug fixes, performance updates, and small tweaks rather than major outward-facing changes.
MacDailyNews Take: If Apple posts any info about tvOS 15.5.1 it’ll be found here.
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As usual, as with the last 20 releases, no idea what Apple “improved”. Every looks the same the last 5 years. No change in UI, no new features, nothing.
You might try learning to read…..
https://developer.apple.com/documentation/ios-ipados-release-notes/ios-ipados-15_5-release-notes
I did read the release notes. Its a confirmation of my experience to date: no useable improvements no overhaul of the UI. It’s a hobby.