Fuji Rumors reported on November 4 that a new Tamron patent shows the design of three medium format lenses. The patent was first spotted by the site mirrorlessrumors. According to the report, this is the first time Tamron has been seen designing lenses that can cover the 44x33mm sensor used by the Fujifilm GFX and Hasselblad X2D cameras.
The report does not list focal lengths, apertures or a launch window in the part available to me, so nothing is known about what the lenses would be. A patent only shows that a company has studied an optical design. It does not mean a product is planned or will be sold.
The story matters because, as the site notes, the GFX system currently has only two third-party autofocus lenses. The site hopes a third brand could join them. For GFX owners, another maker would mean more choice and possibly lower prices than the first-party lenses, but that is only a hope at this stage.
Reliability is low. This is a patent filing and has not been confirmed by Tamron.