[Klaus]

http://www.fujifilm.com/products/digital_cameras/gfx/roadmap/index.html

[you2]

I forget what is the conversion factor for focal length to 35mm. They have a 250 and 200 mm (zoom) lens on the way.

[Brightcolours]

if you go by the bit more meaningful horizontal dimension of the frame, the crop factor is 0.82x compared to 135 format.
If you go by the bit less meaningful diagonal dimension of the frame, the crop factor is 0.79x compared to 135 format.
If you go by for some people/applications meaningful vertical dimension of the frame, the crop factor is 0.73x compared to 135mm format.