Just so everyone is aware, in addition to the original Gizmodo article someone else posted earlier in this thread, this issue is now hitting many other blogs:
http://www.macrumors.com/2013/06/20/new-macbook-air-owners-complaining-of-wi-fi- issues/
http://www.businessinsider.com/macbook-air-wi-fi-problems-2013-6
http://www.designntrend.com/articles/5114/20130621/macbook-air-2013-review-rumor s-specs-wi-fi-connectivity-issues.htm
http://bgr.com/2013/06/20/macbook-air-wi-fi-connection-bug/
http://www.ubergizmo.com/2013/06/2013-macbook-air-wi-fi-issues-reported/
http://www.idigitaltimes.com/articles/18428/20130621/macbook-air-wifi-problems-2 013-802-11ac.htm
This I thought was particularly funny:
"there does seem to be a gadget god serving up a possible solution to the WiFi issue. Wifiguru reports..."
Unfortunately, they're not telling us anything we didn't already know, but hopefully it will increase pressure on Apple to acknowledge the issue and come up with a fix. My MBA was purchased through a third party in HK, and I'm now in Mainland China, so I have no hope of having it returned or exchanged :-(((
I appreciate what wifiguru is trying to do, more specifics will help us identify the issue, but unfortunately we will not be able 'resolve the issue' because we do not have control over routers that we use when on the road.