of autocad there is a beta, you do not know when it will come out, of revit still nothing, but most likely it will be written also for mac. of course I am talking about the native versions for os x, if instead install them on win with bootcamp, turn like on a normal pc.
If I can: it doesn't make sense to buy a mac and then let us go an app written per pc. Using a winzozz emulator is equivalent to using a pc. if it's just for revit I think it's not worth it. otherwise if you also use other sw (native mac) for graphics then it is definitely a recommended purchase.
Bye.