http://www.roadtovr.com/sony-confirms-new-90hz-display-mode-for-playstation-vr-formerly-morpheus/
Now Sony has confirmed that PlayStation VR will have a third, native 90Hz mode. This will offer developers, who want the benefits of faster native rendering, a new middle option for their target framerate.
A representative from Sony working closely with PlayStation VR confirmed to Road to VR that the new 90Hz display mode does not come from a new display, but rather new firmware. The rep told us that they expect the 60Hz rendering + 120Hz reprojection mode to be a very popular choice, though the native 90Hz and 120Hz options will be there for developers who want to push the limits; it also affords good headway for future growth as game developers get increasingly adept at optimizing their virtual reality experiences for the PS4.