I have seen photo's of the experimental aircrft. How far Beoing is with the R & D I don't know, but the flying wing has been out since the 1940's. The design its self creates the least amount of parasitic drag. I think it will be a few ...
The concept implies new airport terminals (and probably taxiways....). Most probably the aircraft would be parked parallel to the terminal building, and not perpendicular. Yes it will take a while before this interesting concept flies! But I believe it will.
Is Boing really developping this project now? If so, when could we see the new baby? That would be quite a competition to the A-380...