I’ve received my Oculus Rift DK2 and am working on updating the CtrlAltStudio Viewer to support it. Unfortunately, it’s not just a recompile; it’s actually a significant amount of work. But it is on its way!
UPDATE, 11 Aug 2014: The Rift SDK 0.4.0 had some show-stopper bugs. SDK 0.4.1 has just been released; I’ll give it a try.
UPDATE, 18 Aug 2014: Rift SDK 0.4.1 still has major problems with OpenGL and Direct mode, which is ultimately what the viewer should use. I’m having a look at doing something extended mode for the interim.