(Above: Optical design of a new Pentax 18-55mm F3.5-6.7 lens)
See this new Pentax patent, via Mirrorless Rumors.
The most mysterious thing is that 3.0mm back focus distance (of which the Pentax Q's is 9.2mm), especially consider that it is an APS-C lens, which at the first glance I believe that it is just a typo, but which is actually NOT! :-o
After all, could it be still using the K-mount with such short back focus distance?