The traditional “splaying of the device” has been performed successfully on the new MacBook Air by the teardown experts and hand models at iFixit. The most user-relevant finding appears to be that the SSD module is user-replaceable — i.e. Apple hasn’t seen fit to physically bond it to the motherboard. Yet.
Apart from that and some minor layout changes to accommodate the larger processor die and Thunderbolt controller (and of course the LED lighting for the keyboard), there isn’t much to write home about. The new Air is a lot like the old Air — just faster. The big design tricks took place a long time ago, when they were first making the design choices that made this form factor possible. Check out the whole teardown here.