Maybe they test a Zune early sample on an old Vista beta. I think we should wait the Vista official launch to give a verdict in this issue.
Though seemingly implausible, the screenshot below tells the story (while raising some questions at the same time).”This operating system is currently not supported by Zune,” reads an error message when trying to install Zune software on the latest versions of Microsoft’s own Windows Vista operating system. In an official Zune support document, Microsoft, which will begin selling Vista to business customers in two weeks, confirms that the system “is not supported at this time.”
Anyway will be very “funny” if the incompatibility is true :). At this moment on Zune website is posted this announce: Windows Vista is not supported at this time. Check back soon for updates.
So, we can suppose that will be a Vista support in the future.