I kinda have my doubts that this would work, but I too would love to be proven wrong on that count. What is not clear is if the 17mm f4 TSE image circle of 67.2mm or so includes the shift or not. If that includes the shift, then there may not be anything to gain with this lens mounted on a Phase body, if that was even possible. If the image circle does NOT include the shift (hard to imagine that large an image circle for a DSLR body), then what is the additional shift gain?
This could be a very interesting lens on a FF DSLR, as it seems intended. If the corner-to-corner sharpness holds up, as they are advertising, this could breathe some life into doing interiors with a Canon body, and gaining the higher ISO capabilities if needed....say in churches, museums, and other dimly lit places.
LJ