DTI editor Bill Sweetman looks at some contracts floating around the aerospace world, and has condluded that Northrop Grumman has been awarded “a classified Air Force contract to develop a secret bomber prototype”, likely based on the now canceled J-UCAS program, probably based on the X-47B that NG is making for the Navy as a part of the UCAS-D program that succeded the J-UCas:

He has a more detailed article here (Requires loading of proprietary Nxtbook reader), which indicates that the bomber would have a roughly 2000 mile range with a 14-28K pound bombload, which makes it about 1/2 the size of the B-2, and he theorizes that there may be some advances in terms of CFD and control systems.

Of course, the one question that does not get answered is why we really need this.