According to HCam.de the new Zeiss Otus 100mm f/1.4 fully covers the Fujifilm GFX 44 x 33mm sensor. Other Otus lenses perform similarly, but this is the first we have heard about this unique lens for portraiture. It will be interesting to see how Otus lenses perform when the Fujifilm GFX100 comes out since Otus lenses are designed for high resolution and without compromise to the extent that some photographers find Otus to be too clinical.
You can get the new Zeiss Otus 100mm f/1.4 at B&H Photo / Adorama
As for an Adapter, Fotodiox and Kipon make quality dumb adapters, but HCam.de used a Techart AF Adapter.
Make sure you come back on May 23rd for our live blog of the announcement!
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Fujifilm GFX50R: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama
Zeiss Otus 100mm f/1.4: B&H Photo / Adorama