Looks like there are new Beta VM Additions (from 13.709 to 13.715) available over at connect.microsoft.com. 

Thanks to Tony who has more info in his post ‘VM Additions Update‘.  A snippet is below:

It is not clear from the download location (the date on the page didn’t change) but the latest VM Additions at connect include support for Vista Beta 2.
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The VM Additions for Windows Server 2003 SP1 are on Microsoft Download