I currently have a canon cl 8-120mm f/1.4-2.1 lens which uses the VL mount. Canon's goal appeared to have been to make this a standard system similar to the Micro Four Thirds system. See http://www.canon.com/camera-museum/history/canon_story/1987_1991/1987_1991.html (the section that mentions the VL mount is called Steady Refinement of Video Camcorder Technology).
I already performed many searches using Google and this website. So far all that I have found is that the flange distance is 20mm according to http://camera-wiki.org/wiki/Lens_mounts.
I would like to be able to hook the lens up to a microcontroller and operate the lens. This will require having access to the pinout of the lens and a protocol specification in order to send commands to the lens. Does anyone have access to these? I do not have any cameras that use this lens system. I have access to only the lens itself. I added the reverse-engineering tag in case anyone has done any reverse engineering on the lens. I would like to hear about that as well.
Also I have read discussions about this lens and it seems that other people have unreasonable goals such as mounting this lens on their DSLR. Someone will then point out that the lens will not cover the entire sensor. To save everyone some time; I am already aware of this. I will use this for smaller sensors.