You won't be seeing refurbs for a while. The 2011 Airs haven't even been out for 2 weeks yet. :-/ Think months.
Why would you want refurbished.... It will be only 15% cheaper. You can get that kind of discount online or some stores.
Actually, you may see them soon, especially with Toshiba hard drives and LG screens... (and if you do, pick one up pronto! Because they rock no matter what the brand of components inside! )
Go to the list of Mac prices on the Apple Insider web site. They show prices for new MBA that are better than a refurbb would be.
The refurbished prices are usually 15% off list, so will be better than the AppleInsider prices. Also, MacMall is the lowest so far, and they don't have all the configurations in yet, so they aren't yet an option for everyone, either.