Throughout the week, YouTube has been temporarily flipping back to its previous design, but unfortunately, it never lasts longer than maybe a few minutes, at any random given moment during the day.
I really miss the previous design, if mainly because I still don't like how they've made the video player smaller and cropping the right and bottom edges of the video, which I keep having to zoom the page in to 110% to bring the player up to a decent size and to do away with the cropping, even though it puts the video player in a big open space by itself, while everything else (recommended, description, comments) is just stacked on top of each other below.