In this thread we've already talked about the MZ-1, a professional SLR which should have been released in the late 1990s.
The FA Limited lenses were designed for the MZ-1 as well as for the 24x36 DSLR, the internal codename of which was MR-52 and the unofficial trade name MZ-D.
Pentax spent a fortune in the development of the MR-52 / MZ-D, much more than expected. A rough prototype was presented at Photokina 2000 and a more advanced version at PMA 2001 but the camera was eventually cancelled in October 2001 because of its expensive, energy inefficient and poorly performing Philips CCD sensor (which made it into the poorly received Contax N Digital that Kyocera persisted in launching, which accelerated the demise of Contax).
Given the budget overruns of the MR-52 project, the MZ-1 project had been stopped. Later, what could be reused from the development of the MZ-D made it into the quickly-designed MZ-S.
Back to the MZ-1 and fast forward until mid-February 2019. You've heard of Kimio Tanaka, a professional Japanese photographer mainly known for car photography, also a kind of celebrity photographer who often appears in magazines. He's been involved with Ricoh presentations and product endorsements before. He is the one who published pictures of and taken with the stillborn Pentax-09 Telephoto Macro and who published the first in-depth review of (a prototype version of) the HD Pentax-D FA★ 50mm f/1.4 SDM AW.
On his Twitter account
田中希美男 (@thisistanaka) | Twitter Kimio Tanaka recently published three pictures of a design mock-up that corresponds to the MZ-1. The upper dials can be removed -may be one of the purposes of this mock-up was to compare and choose between different dial designs.
If this mock-up comes out ten days before CP+, in the hands of Kimio Tanaka, it is not a coincidence. I suppose it will be associated in one way or another with the commemoration of the 100th anniversary of the founding of Asahi Optical. Perhaps a re-edition of this mock-up will be one of the commemorative goods that Ricoh Imaging plan to launch on this occasion.