I dig it, the upcoming videos are listed where my attention is already. I can understand why they set it at the bottom previously, but it always seemed clunky. This will be easier to look through. Although, most of my youtube playlists windows get minimized to the dock. Except, of course, the Asian Club Pot-Luck Playlist, it went full-screen. (I am French-German, but due to my elevated appreciation for the pan-asian cultures I was invited to join with ceremonial open arms.)
I also like the UI of the menu icon that has been showing up on all of Google's interfaces. You can see it right under the logo in the top right. It expands to the image on the left and pushes content to the right.