Today, BestBuy.com has reported that it has ran out of MacBook Airs in its inventory as the expected revisions to the MacBook Air is soon to follow. 9to5Mac reports that this is a move by Apple that will only sell the remaining stock of Macbook Airs at their retail locations:
This typically means that supplies are so constrained that they have to focus their remaining inventory on their popular physical retail stores. BestBuy.com does not provide a date for when they will be shipping the notebooks again, but these types of things are usually indicative of a product refresh.
Rumors have been floating around the past few weeks about a refresh for the Macbook Air line since the release of the new Sandybridge processors by Intel.

