tvOS 9.1 can be downloaded over-the-air through the Settings app on the fourth-generation Apple TV by going to System -> Software Update.
tvOS 9.1 betas introduced support for Siri search for Apple Music, allowing fourth-generation Apple TV owners to ask Siri to play content from Apple Music. Siri for Apple Music on the Apple TV works similarly to Siri for Apple Music on iOS devices, enabling queries like "What was the top song in 1980?" or "Play Adele's latest single." It is not yet clear if this feature made it into the final version of tvOS 9.1.
The tvOS update includes several bug fixes for issues discovered in the current version of tvOS, and according to beta testing notes, it features improvements to networking and scrolling.
tvOS 9.1 is the first major update to tvOS, but it's the second update overall. Apple previously released tvOS 9.0.1 with under-the-hood bug fixes and performance improvements.
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