Probably, Olympus was designing lenses that others like Sigma manufactured going back to the 4/3 line. We already know that the Olympu 75mm f1.8 was made by Sigma and probably also the 300mm F4 Pro.
With the limited resources OM Systems has, it is far more efficient to use the design pattern for the Zuiko 50-200 SWD and have Sigma update the focus motor and manufacture the lens as and OEM. A 50-200 f2.8-3.5 with an m43 snappy focus motor, Sync IS, and weather sealing, compatible with the MC-14 would be a very popular lens.
Probably this has been in the works since before the acquisition.
There’s already such a lens, and it was expressly designed for MFT. It’s the Panasonic-Leica 50-200 f/2.8-4 lens.
I just picked that lens up today to replace my OM 40-150 f/2.8 that I just sold. It’s sure to be cheaper than what OMS will charge for a likely Signa rebrand, so why no love for the existing MFT specific lens? It’s tiny compared to the FF version that may underlie this new offering.
That said, I can understand if MC-14 TC or OIS is a requirement. But the size difference- if it turns out to be yet another rebrand- will be significant.