Since everybody has broken it down in detail, i'll keep it short and sweet. The new look SUCKS. I found my channel had been changed, and I saw in the intro message it could be changed back to the old by going to "appearances" in the channel editor, so I closed the message and did that.
What's the point of a background image if you can't even see it!? What's the point of channel comments if you can't see them on yours or anybody elses channel!? Friends are gone. Subscribers are gone. And I don't want my channel to look like everyone elses with that gray crap.