updated 06:45 pm EDT, Thu July 7, 2011
New UI currently available through TestTube
YouTube is currently previewing a redesigned interface, which is referred to by the monicker Cosmic Panda. The revamped UI offers a completely new look for the site's video player, playlists presentation and channels. The modernized designs place a dark grey background behind videos, while new editing tools are available to customize a channel.
Chrome users will be able to keep watching content when switching between videos, playlists and channels.
The Cosmic Panda redesign is available as part of YouTube's TestTube experimental settings.