I found these things notable from the SAR article:
Quote: "... three different new FF sensors have been tested by Sony, 24, 32 and 36 Megapixel. I am yet not 100% sure but Sony may picked up the 32MP sensor. What I am sure about is that it will be announced along two Zeiss FF lenses. A zoom and a prime. "
Perhaps Pentax has been evaluating the same sensor options for it's native FF.
Rolling out the new FF camera with new lenses is also no doubt what Pentax is probably doing. Sony has the advantage of closely partnering with a 3rd party lens developer, however.
I'm still a bit confused though about the idea of a FF NEX. Does that mean my current NEX lenses will still work on the FF NEX, but with lots of vignetting, or would the FF NEX be an entirely new mount?