I haven't had a chance to play with it yet. But its out and word on the street is it will be v1 before the end of the year.   Go download, play, migrate & enjoy :-)

Download it here: http://www.microsoft.com/downloads/details.aspx?familyid=a24d1e00-cd35-4f66-baa0-2362bdde0766&displaylang=en&tm