The Boeing BWB concept is listed as one of five X-planes for possible further development.
See the NASA web page here http://www.nasa.gov/aero/nasa-green-aviation-x-planes
The Boeing X-48 BWB was built by Cranfield Aerospace Solutions to provide a dynamically scaled flying test aircraft. Cranfield Aerospace Solutions engineers were able to take the design and requirements from Boeing and produce both a wind tunnel model and a fully remotely flown aircraft. CAeS worked closely with Boeing through the design process and then continued to provide support during the flight testing.

Read more about Unmanned Air Systems and Rapid Prototyping

X-48B built by Cranfield Aerospace Solutions in flight
X-48C built by Cranfield Aerospace Solutions in wind tunnel