A software update is now available for the new-as-in-2013 MacBook Air. Apple describes it as follows:
This update fixes an issue that in rare instances may cause an intermittent loss in wireless connectivity, an issue with Adobe Photoshop which may cause occasional screen flickering, and an issue which may cause audio volume to fluctuate during video playback.
If you've got the new Air, go get the new update. I'll be applying mine tonight and testing it tomorrow. If you run the fix, let me know if it solved whatever ailed you.