A few days ago Ricoh filed a patent application in Japan for several full-frame mirrorless telephoto lenses: 70-300mm f/4.5-5.6 100-400mm f/4.5-5.6 100-300mm f/2.8-4 A month ago another Ricoh patent also described sumular mirrorless lenses: 70-400mm 70-300mm The third 150-600mm lens described in the patent is for DSLR cameras (equipped with image stabilization)
It seems that Canon filed a patent application for technology that is using image sensor shift to reduce the need for an AA filter:
Ricoh filed two new patents for APS-C DSLR lenses:
Ricoh has a new patent for a 23mm and 28mm f/2.8 APS-C lenses designed for a compact camera (new Ricoh GR maybe?):
Ricoh has a patent (P2018-224783) for what appears to be a new Pentax DFA 70-300mm f/4.5-5.6 SR or similar:
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