You do not see any possibilities to control an EF Autofocus lens via Bluetooth by that new Flow wireless controller?
I thought it could be done like they used it via USB with the Okii follow focus for some Canon DSLRs ( http://www.okii.net/product_p/fc1.htm)
The difference is all is touch controlled. But I did have the dream to control the focus on active EF-Lenses wirelessly without any additonal focus motors, because we already have the motors inside the lens! I think it is absolutely worth to keep that contoller in mind....