According to sources for Chronic, Apple will be refreshing their lineup of MacBook Airs on Wednesday, the 15th. The next-gen Airs will likely feature updated Sandybridge Intel processors as well as the new Thunderbolt interconnect, but anything more than that is complete speculation. Rumors also suggest that Apple will be updating their retail stores Tuesday night, but it is unknown what other changes will be made.
UPDATE: ChronicWire has issued a correction for this leak, citing that his sources had mixed up part numbers. He says that Apple Stores across the United States will be receiving unlocked iPhones for the first time instead.