At a glance it appears the most highly coveted and praised aspect of this upgrade will be the return of the backlit keyboard. Good, but only bringing that aspect to parity with the MBP. Other than this, what? Thunderbolt. Good, but same thing, parity with MBP. The option of 256GB flash storage? A notable improvement in option, but again only somewhat less parity with the MBP.
If you think I'm only trying to sing the praises of the MacBook Pro, I'm not. All else equal I would still favor the Air for its lightness and elegant styling. If nice the MBP recently upgraded to Sandy Bridge, Apple still some explaining to do with their subsequent downgrading of the GPU. So unfortunately parity with the Air on a downsized GPU as well, but seemingly not much of an uptick in horsepower to compensate for it.
What am I missing? Oh, probably that every Apple fanboy will now have to run out and buy an Air because this is the latest iteration. Why else?
Well, not if one was expecting Apple to introduce a must-have Air. This seems only a modest new offering, with no reason to buy it unless one was really in the market for an Air anyway.