Apple released tvOS 9.0.1 for the company's new Apple TV models, though the update didn't come with patch notes. A reasonable bet is that this is a maintenance release with bug fixes and stability improvements.
To download the update, go to Setting -> Software Update. TMO staff have reported the over-the-air (OTA) update process worked as advertised.
Here's what you can expect to see when you run the update (screenshots courtesy of our friend Jim Tanous at TekRevue):
Download and Install tvOS 9.0.1
About tvOS 9.0.1