From Version 5.9 release notes:
Have an Apple TV 4th Generation? Download the new Nest app from your Apple TV and enjoy the convenience of monitoring your home and viewing all of your Nest Cam live video feeds right from your TV.
Been waiting a year for this. The use case for us is simple: you place semi-concious primate on crib, cross fingers, and then stare into TV instead of iOS apps for heavenly signs of sleep