Source: http://egami.blog.so-net.ne.jp/2012-06-22 (in Japanese)
Note that the back focus of this lens is in 4.181mm this time. It seems that a new line of Pentax APS-C lenses is coming, which is possibly for the K-0x series of mirrorless. It is because for that short back focus distance, it is impossible to use these lenses for a traditional DSLR(eflex) that has a mirror.
By the way, as we see Pentax has not yet filed any new lens patent for any 135 Full Frame lens, Is our Pentax FF dream once again to be in vain? :-(
Related:-
One More Super Short Back Focus New Pentax Lens Patent (Super Slow Too!)
What If When a Pentax FF Body Really Comes (My Own Case Study)
New Pentax FF Rumour