Apple has seen fit to release the latest version of tvOS to 4th-generation Apple TV owners.
Apple has released tvOS 9.2.1 to the public today, making the update available for the fourth-generation Apple TV. The update, which saw weeks of beta releases, focuses on behind-the-scenes tweaks and improvements, rather than throwing in new front-facing features for the user.
The new software is available now, and fourth-gen Apple TV owners can install it when they’re able. If you don’t want to wait, you can head into Settings, then find the System option and select Software Updates from within. That should get the new software installing.