Confused? So am I, a little. Frame announced at AU this year that they obtained complete certification from Autodesk for applications in a virtual environment. I need to pour into this a little deeper (and you can too in the article below) but you can now run Revit, fully supported in a browser. If so, and it works, this is a great new avenue for Mac owning Revit Users!
Take a look at the article on Architosh