I recently learned about the substance graphene. It is a very thin layer of carbon and has amazing properties that have people likening it to plastic in its usefulness. One such potential use is in the body/electronics interface for prostheses. This article discusses a lab working on research toward using graphene in this application. It's far out but also probably far off.
-> http://www.technologyreview.com/view/511141/graphene-and-the-emergingtechnology-of-neural-prostheses/
-> http://www.technologyreview.com/view/511141/graphene-and-the-emergingtechnology-of-neural-prostheses/