I believe that, although it is indeed fictionnal (today), the Boeing Blended wing was a real study from Boeing. They were trying to define a new aircraft shape that could cary more passengers and more fuel, something like that.
On a side note, this plane has been made by Lionheart from SimOuthouse (I can never remember his real name

), for testing a new modelling technique in FS9, in which the maximum number of polygon per 3D object has been increased to virtually unlimited like FSX. The same technique was used to model that red Stearman (the one with a roof over the pilot) that appeared some months ago... a plane that litterally
destroyed my FPS in FSX.
How did that Boeing performed, in terms of smoothness ?