Google is going to release a major update for the Youtube app for Google TV is the next few days. Company published regarding the same in a blog post
According to the post, this update will bring better Youtube experience for Google TV users including smoother navigation. Google has also added a new feature called Discover, which allows users to browser Youtube channel by categories.
Youtube App for Google TV will now support Channel pages, and you will be able to subscribe to your favorite channels with just a click.
Along with these changes, Google TV users will be able to comment, give a thumbs up/down or add Youtube videos to playlists.
There is no word on which date will this update go live, but we might see it as early as today. You will be able to grab the update from Android Market