We had heard reliable reports that Apple will be launching a new version of their Airport Express next week, likely on Tuesday. Apple Retail stores should have stock of the new Airport Express by mid week. The new model will be priced at the same price as the current model ($99). Though details have not been confirmed, it appears the upgrade will most likely include support for 802.11n wireless networking.
MacGeneration points to an prematurely updated description at the Swiss Apple Store that describes 802.11n Wifi support.
BTW, it would be nice to see Apple plug the hole in its wireless-n Airport Extreme: meaning support simultaneous dual-band. According to the original leaked page, the price for the Airport Express won't change, so that will be a nice perk. We'll see if it rolls out this week or not.