My current MBA has an overheating problem because they didn't bother to design with heat dissipation in mind. Going to wait and see if similar complaints come up about current gen.
That is in fact a problem with the Air, the fans are simply not powerful enough to cool the CPU at full speed for more than 5 minutes. You're wise to wait (I'm not).
That is, frankly, a poor design.
I'm tempted to buy one but this is the one thing stopping me (existing MBA owner).