Classified Platform doing part of the Global Hawk mission

So the USAF have acknowledged that intelligence gathering is currently being done by a classified platform able to take over part of what the Global Hawk currently does:

http://www.flightglobal.com/blogs/the-dewline/2013/04/usaf-can-perform-parts-of-glob.html

This may not be news, but it interesting that they are happy to admit the existence on classified intelligence gathering aircraft. Also interesting to read about the rumours of aircraft flying out of Nevada…

High altitude and stealthy, but is it manned?