Disappointing performance wise due to adherence to Japanese regs but you have to think that perhaps there is an override on it somewhere? Oh well, it looks fast but sidepull brakes are a joke on there but probably sufficient to slow it down from 20 mph no problem. I doubt it will be cheap either. They allude to Yamaha's involvement with the concept and also Honda had some motorized bikes at the same show.
http://www.gizmag.com/lexus-hb-electric-bicycle/13175/