As soon as I switched channel designs to the new one, I was instantly repulsed. My channel comments were missing, the thumbnails were hideous. I switched back in 30 seconds. I cannot stand the look (and the organization of the comment/reply system under videos is still bad--putting avatars next to them to instantly identify comments from different users would be a start). It would be a bad decision on your part not to get rid of it and switch to the former layout.
Why would you remove channel comments? That's a staple. That's how people know your channel is alive.
Don't finalize this design. Burn it, kill it, and if you're going to make a new layout, keep it similar to the former layout.