Its pretty certain that seat tube/BB motors saw some 'testing' in the pro platoon, and we can all buy one. Hub motors in a standard hub shell are an entirely different thing. Unless I missed it, no one has shown a concept let alone a working model yet (some sketches, yes...).
That may be so, but my knowledge about that is not good enough, thus I refrain from making to many claims about it. Doping however, that I know is a vivid part of professional sport and that includes cycling.
Hub motors seems like it is something for the future.