http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_11_01_2013_p0-632731.xml
"Ever since Lockheed’s unsurpassed SR-71 Blackbird was retired from U.S. Air Force service almost two decades ago, the perennial question has been: Will it ever be succeeded by a new-generation, higher-speed aircraft and, if so, when? That is, until now. After years of silence on the subject, Lockheed Martin’s Skunk Works has revealed exclusively to AW&ST details of long-running plans for what it describes as an affordable hypersonic intelligence, surveillance and reconnaissance (ISR) and strike platform that could enter development in demonstrator form as soon as 2018. Dubbed the SR-72, the twin-engine aircraft is designed for a Mach 6 cruise, around twice the speed of its forebear, and will have the optional capability to strike targets" <more> Did you say Mach 6?
