I dont know how you are searching. Just a few links {it takes some 30 seconds to me}:
Unfortunately, the museum's exotic and hugely cool YF-23A Black Widow II fighter (which lost the the USAF's ATF competition to the Lockheed Martin
F/A-22A Raptor) was on loan to Northrop Grumman for use in promoting the F/B-23 concept to the USAF, but I was lucky enough to see it (alongside the
X-47B UCAV prototype) at the Northrop Grumman factory as we drove by. link
A aparição do F/B-23 na internet aconteceu após a decisão do comando da USAF de possibilitar a apresentação de propostas alternativas em seu
programa. A USAF irá estudar estas alternativas em um prazo de até 18 meses. Com isso, e todas as fases de desenvolvimento e testes necessárias
para finalizar o projeto, o novo bombardeiro poderá entrar em serviço em 2018.
link
Until now, the company's offerings are known to include an upgraded B-2, X-47B unmanned combat air vehicle (UCAV) -based studies and possible designs
based on its quiet supersonic technology programme. The distinctive, rhomboid-winged YF-23A lost out to Lockheed Martin's YF-22 in the ATF
competition in 1991, but proved a valuable technology testbed for Northrop Grumman, which gave it all-aspect stealth. The company says it "drew upon
a wide range of experience for its response to the interim bomber RFI, and the YF-23 is one".
link
In late 2004, Northrop Grumman proposed a YF-23 based design for the USAF's interim bomber requirement, a role for which the FB-22 and B-1R are also
competing.
link
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