Aviation Week speculates that Northrop Grumman may be building a secret prototype of the Next Generation Bomber (NGB).
It seems Northrop Grumman's first quarter financial results include a $2 billion "restricted programs" contract that would support earlier reports that the company has a sole-source contract to build a prototype.
It is likely that the prototype will build on technology under development for the Navy's X-47B Unmanned Combat Air System Demonstrator (UCAS-D), putting within reach USAF's goal of a 2018 initial operational capability date for the bomber. Industry and USAF sources have talked about a competition in 2010, leading to the start of systems development and demonstration in 2011.
Much more at Aviation Week's article, Ultra Stealth.