I find it hilarious that some people here are digging the black bezel and glass screen. The black bezel is a way of making a *fat* bezel look interesting, because a fat bezel is something bad in a laptop, which should have maximal real-estate/size ratio. The bezel on Apple laptops are getting fatter and fatter since the Ti-Powerbook, and many consumers don't even notice.
The glass screen is a simple way to make a laptop cheaper, while adding lots of unnecessary weight (bad for the Air!). It has no advantage, except for movie watching in low-light conditions, something people who use their laptops for work don't view as a most important criterion.
People are talking about necessity of bringing the Air in line with the other products. The screen part of the MB and the MBP were a huge step back from the last versions (the unibody of course being a step forward), which is why they had to re-introduce the mate screen and silver bezel in the 17 inch MBP. In the future, the black bezel will with certainty disappear, because bezels will disappear on laptops. The glass screen will disappear because it only adds weight and reflections.
The only thing that's really timely on the Air (as on the MB and MBP) is to have a less gigantic bezel and a higher resolution screen. They could fit a 1440x900 screen with close to 14 inches in the same footprint. And please don't tell me "oh, I don't want higher resolution because the font gets too small", because that's BS because the minimum font size can be adjusted in OS X and higher res fonts at a fixed size are crisper and more easily legible.
PS: Now that I mentioned the MB and MBP, I should also say that optical drives will disappear. They're the modern floppy drives. Like the glass screen, mostly folks who use their laptops for entertainment want optical drives. The current line of MB and MBP, while I own one of the latter, are dinosaurs, except they'll only last 2 years.
Hey, I'm not saying I dig the black bezel, I'm just looking into my crystal ball. I just think the Air will converge with their other products on the design-front. It makes sense to me that Apple would do that.