image by CameraSize
The Fuji GFX-50R still is not the smallest MF camera yet. The Hasselblad is quite a bit smaller and lighter. That said the Fuji is relatively cheap and you can preorder it now for $4,500 at Amazon US and BHphoto.
And Fujirumors just found the Fujifilm GFX 50R and Fujifilm GFX 100S product catalogue links: