In addition to the new beta releases for iOS and watchOS, Apple has released the first developer beta of tvOS 9.2.1 for the Apple TV. Developers can get it right now from the tvOS Developer Resource Center.

Following the fairly important release of tvOS 9.2, which added app folders, Siri text field dictation, and more, it's expected that version 9.2.1 would be a fairly minor release, likely containing bug fixes and performance improvements.