I saw this conversation on DPReview regarding Pentax's new 50/1.4 for 35 FF (K-1). It might be true. The new 50/1.4 from Pentax looks similar to Tokina's new 50/1.4. Earlier Pentax also had a new 15-30/2.8 for 35 FF, and it looks almost identical to Tamron's 15-30/2.8, including numbers of lenses and groups.
If this is true and Ricoh Pentax no longer has the capability to design high-end camera lenses, I feel very pessimistic about the future of its 645 line. Those who already have a few Pentax lenses that can cover the 50mmx40mm 645 FF might be willing to buy the new 645 FF from Pentax, but that's probably it. Those who are not in the Pentax camp will very likely think twice before they jump in, even if Pentax produces a 645 FF camera. Who will want to buy camera bodies from a company that is no longer capable of producing exciting new lenses to match the need of next-generation high-resolution sensors? I know I won't.
As a Pentax user for more than a decade (Pentax 67, Pentax's astronomical telescopes, and now 645z), I feel quite sad when I saw that.