Apple has today released tvOS 9.1 for the fourth-generation Apple TV.
No release notes are currently available from Apple, so the complete list of improvements and changes in this update is unknown.
If you encounter any accessibility-related changes, please be sure to let us know in the comments.
To install tvOS 9.1 on a fourth-generation Apple TV, go to the Settings channel then look for the System section near the bottom. From here look for Software Updates under Maintenance, then select Update Software and Download and Install.