MAC support for new Report Designer (Report Builder)

Is the new Report Designer (Report Builder) interface still a Windows click-once application? Or is there any possibility this will work with MACs (if it's not a click-once application)?

We have a lot of potential customers (education) that are looking for MAC support for ad-hoc access.

Yes, Report Builder is still a Windows application. We do not have a HTML or Silverlight version of Report Builder but these are under consideration for a post-2008 release.