This app is scheduled to launch publicly later this month.
This edition of YouTube is optimized for the new user interface used by Xbox Live based on the Metro guidelines.
It features support for the Microsoft Kinect accessory and comes with usual features like Watch Later, Playlists, Favorites, and Subscriptions.
Comments are not accessible from this interface right now. Though users can like/dislike videos and access captions if they are available for the video.