Don't bother visiting that site if you're reading this on a computer. It will simply take you do YouTube's home page. You must access it with a PS3 or Wii to get the TV version.
According to the blog post, the new interface was designed to provide "a dynamic, lean-back, 10-foot television viewing experience...With enlarged text and simplified navigation [that] makes watching YouTube on your TV as easy and intuitive as possible."