Today I was greeted with a new interface for Youtube. It seems that there are a lot more collapsible elements now, and the biggest functionality change seems to be a new "like" vs. "dislike" option, where we used to have the "Favorite" button. There are also new Share buttons, and there is a nice toggle for "Autoplay" of your recommendations. I'm not sure yet if I like everything, it seems to require a bit more work to be perfect, but with all the functionality of Youtube, this probably is a good thing.