They got that beta activated for me today. It's still pretty primitive, I would say, as I don't see much new features. A little disappointment that the link at the right hand pane didn't work and there isn't any way to get rid of it. That right hand pane has reduced the viewing area, however, if you are using IE7 you could zoom in (as in Opera) to view more.
Too bad I have only 25Mb of storage therefore I can't really seriously test this out.