Revit on MAC has been available and working for a couple of years now using Bootcamp and/or Parralels (links below), but guess what?
Well, I'll tell you; ADSK now 'supports' Parallels...officially!! CLICK ME
So if you use a MAC then this may be the news you've been waiting for; or if you just need an official word on the support possibilities now available to us then this article is for you too.
Just consider that Bootcamp is a solution to virtualization and may be recommended, depending on how you want to work.
Do you want to use your whole MAC for Revit or just parts of it?
All = Bootcamp
Part = Parallels
Best = Both
Or you can use a PC and ignore all of this...