This is not - currently - a civillian project but a military one. I have seen this design mooted before in relation to DARPA/NASA as a possible heavy lifter for the USAF in time. That's why there are no windows in the pictures to far.
In time, of course, it could become the real thing for civillian use. Still, it's going to take a lot of research validation and heaps of investment dollars. I think Boeing has its plate a bit full at the moment to be throwing more money and resources at a new civil project.