Most of these are nothing more than art bikes with no real innovation. Some of them will not do what they claim because the mechanics were not thought out enough. I would love to collect them, but most exist only as digital images.
If a motor could drive the inside of the rim it could slow down motor more than using a sheave allowing it to climb hills better with less power? But it is not much different than a regular bike.
google "concept bicycles" for more info.