MG Siegler, in summing up his piece on the ramifications of the new Retina display MacBook Pro:
I get asked all the time by people what MacBook I would recommend to buy. It used to be an easy answer, but it got a lot more complicated today. (Aside from everything I said above, do you dare buy a new Air when a Retina one must be in the works?)
This is a great question, albeit a perplexing one. If it were me, I’d be tempted to wait.
The displays on the Airs are fantastic, but they’re not Retina fantastic. I have the Sandy Bridge + Thunderbolt 11-inch model, and am very happy with it. That said, there’s absolutely no question the Retina MacBook Pro is the future of Mac notebooks. In time, the Airs will be Retina-ized. The question, of course, is when Apple will do it.