If you goto the Boeing Paris Airshow page, you will find a reference to it in the Phantom Works. Also on the NASA web page somewhere.
The interesting thing is that Boeing is still actively working on this concept for a mega jetliner of the future.
Scale models have also been built and flown by NASA/Boeing.
It could provide a fuel saving of 25% over the A380 but will require special materials to build it, and apparently NASA/Boeing aren't there yet.