Previously Photorumors have made the rumour.. It was told that the upcoming Pentax mirrorless would be called the "NC-1".
Today, someone says that the "NC-1" will be smaller than APS-C for its sensor (size). So, this would be a big disappointment if it is really true. Why buy a Pentax mirrorless if it is going to have an even smaller sensor? Why not simply get the proven and more mature micro-4/3 *system*?
It will be just a marketing suicide if this is going to be true! And that if "NC" actually stands for "No APS-C"!? ;-D
Anyway, just remember that all those are just *rumours*, nevertheless!
Last but not least, all the recent rumours don't support that the NC-1 will support the old K-mount lenses.
Besides, it is rumoured that Nikon is making an upper level "Pro" mirrorless, which will be somehow unique in the market:-
http://www.mirrorlessrumors.com/exclusive-nikon-to-launch-a-mirrorless-system-in-april-with-sony-sensor/
So, once again, as it has being said for more than ten years, Pentax is in danger! ;->