The popular 13-inch MacBook Air with a 1.8-gigahertz processor and 256-gigabyte solid-state drive is currently out of stock at resellers Amazon, B&H, MacConnection, and MacMall. In addition, J&R is currently advertising that the thin-and-light notebook is only available for purchase in its brick-and-mortar stores. In fact, the only reseller on AppleInsider's Mac Price Guide that is currently advertising available inventory of that 13-inch MacBook Air configuration is Best Buy.
Notably, a recent roadmap of Apple announcements from KGI Security analyst Ming-Chi Kuo has WWDC pegged for the announcement of new MacBook Airs featuring Intel's next-generation Haswell processors.
Unfortunately, Kuo believes Apple wont be updating the MacBook Air with a Retina Display due to cost, thickness, and production concerns.