This is from the official seminar schedule on Ricoh Imaging for the 2017 CP+ show in Japan that will take place at the end of February – there are basically four sessions on the same topic and one of them suggests the possibilities of new K-mount lenses:
Wex Photographic (UK) is currently offering 20% off selected Pentax lenses with coupon code PENLEN20. In the US you can still get up to $600 off on selected Pentax 645 lenses.
I have not seen Ricoh presenting any new Pentax lens roadmaps at the 2016 Photokina show. If anyone has seen updated versions, please email me. Here are the last known Pentax lens roadmaps from few months ago: