Airport 4.0 : Documentation

Airport Express will come together with a 4.0 update to airport software "suite". If we do not know when this update will be made available, it is already possible to download the documentation.
This paper goes into details about all the possibilities of Airport Express, and answers a rather essential question : yes, Airport Express can act as router and thus share an Internet connection on its own ! It is not only merely a bridge/repeater as previously thought. It also looks like the Airport Admin utility is going to be useable transparently on either type of base station (be it Extreme or Express). Hard to justify the cost of a full blown Aiport Extreme base station for the casual user now...