Photorumors is reporting that Sigma filed a patent P2019-23693A that looks like it’s for the Olympus M. Zuiko Digital ED 45mm f/1.2 Pro. It is not surprising that Olympus would turn to Sigma for help since they have designed some of the highest quality lenses on the market in recent years and professionals expect a lot out the Olympus Pro line of lenses.
Lens information from the patent:
Via Hi-lows-note, Photorumors