Arlignton will be expanding Capital Bikeshare next year and BikeArlington would like input on the proposed station locations. You can find them on their FY13 Expansion web page. They plan to expand service to Columbia Pike, Arlington Blvd., Shirlington/Fairlington, Long Branch Creek, and Cherrydale thanks to the guidance the community has provided through the development of the Capital Bikeshare Transit Development Plan. An aerial and ground-level photo of each location, with station footprint, is available on these pages. At this web link you will find their Crowdsourcing Map with the proposed stations and be able to comment on them.
My only disappointment is that there is not one at the airport. I suppose you can walk from Crystal City. Still, it will be a very big roll-out.