Challenges for developers in a multi-dimensional/multi-sensual devices scenario

The rise of the smartphones completely changed the way we interact with technology and is shaping the very way we conduct our lives. But devices are still limited by the technologies available: what is going to be the market scenario wheninteraction surfaces will become_ubiquitous_multi-dimensional and multi-sensual? What are going to be the challenges for developers? What new possibilities created by human body control over the content are going to lead to?