Andrew - I'd really like to hear if you have any further success with Revit on Macbook Retina Pro. I would prefer to use Apple system but as a REVIT user am always stymied. I went to the apple store fully intending to purchase the new retina pro, convinced that its +/-2800 dpi display would make it a viable portable way to use Revit. the "business wizard" or whatever they are called in Apple-ville was a young woman about 19 years old in short-shorts and a pierced and tattooed assistant (just relaying the visual) who was quite certain that a Revit install was absolutely do-able (just use Partitions, easy, no we won't install it). I asked for a follow up, just find me someone that's ACTUALLY doing it. She couldn't find anyone. Why should they? I read that the apple store is the most profitable retail space in the world at over $6,000/ SF. The next thing closer was Tiffany's at about $,3,400, BestBuy at $800. The customers were practically clubbing each other over the head to get near the shiny little apples.
As a very early adopter of Revit, perennially waiting for Revit for Mac, my bet is not to bet on it. Apple can say "take it or leave it". Autodesk folks have been murmuring "in the works, maybe" for as long as I can remember. I just want to know if there is a path somewhere in the middle from real user.