My impending trip to Europe reminds me that there was another anouncement a couple months ago that wind tunnel testing will proceed on another of the experimental evaluations of the blended wing body (BWB) aircraft. There are a few sites with good summaries and illustrations.
This technology is decades away. Boeing or Airbus could have gambled on it for their latest round of new aircraft, but instead we have the 777 and the 380. They continue the solid tradition of tube with wings aircraft. That was a good decision. BWB has lots of promise but not enough experience.
I expect BWB to emerge first in the freight market. The wide cargo area and direct tail loading are very attractive for cargo. You see this in all the military cargo airplanes. BWB would be an obvious C-5 replacement first.
People are uncomfortable with non-traditional airplanes. The BWB has no good places for side windows, although skylights is a real possibility. That would be an interesting alternative. Would air travel be better if there was good natural lighting throughout the cabin? A BWB passenger load would be more like an auditorium than an airplane. It would also suffer the inverse problem from freight. Passengers do not like tail loading from a ramp. So there will need to be a long period of visual acceptance and some other motivations for acceptance.
The real potential motivator is price and capacity. On routes where the 380 is being considered, a BWB would carry more people, with less ATC interference, probably less wake turbulence aircraft separation problems, and lower fuel burn. That will be a motivator.