"On YouTube video always comes first, and with this new design the site gets out of the way and lets content truly shine. Videos are now at the top of the page, with title and social actions below. Also, playlists have been moved up, so you can easily browse through videos while you watch. Now when you subscribe to your favorite channels, we will add them to your Guide and make them available on every page of the site, and on your mobile device, tablet, and TV," explains YouTube.
The guide is actually a sidebar that's now available on every YouTube page and lets you check your subscriptions, your playlists and the video history. You can also see a list of other videos from the previous page, so you can quickly watch another search result, a different video from the same channel or another video from the homepage.