FYI, after enquiring, I got confirmed in writing today from dealership that: "Updated software for the device is not ready from the manufacturer".
I should add that according to this German forum, people are more or less in the same situation as here. One guy has obviously gone through the speedometer removal process with the same unacceptable result as described earlier by donnielund here. Another one claims to have had the problem corrected with a simple polarity change in the wiring if i understand it correctly, but that needs some more evidence to be fully credible.For your information, this is the German forum on the same issue: http://www.cx5-forum.de/f12/r-scbs-anhaengekupplung-mazda-originalzubehoer-5289.html