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Apple has seeded tvOS 15.3 and HomePod software 15.3 to the public, with the new updates focusing mainly on platform stability, bug fixes, and ecosystem improvements.
Updates to tvOS are generally incremental maintenance releases, adding support for products and services while also improving the experience in small ways. Occasionally, the updates introduce new features, but at this early stage, it doesn't seem to be the case for this release.
The build number for tvOS 15.3 and HomePod software 15.3 is 19K547, up from 19K545 in the release candidate.