Don't count on FF ... I ass-u-me, that like the EF-S lenses, this M dedicated glass was not designed to have an image circle to cover FF. I believe the die is cast.
As a FF proponent, and at the risk of opening the old can of worms, other than at short focal lengths, what REAL advantage does FF have in the real world? Keep in mind, folks, this camera was not designed to be a replacement for a 1-series camera.