Here is a thought-provoking article that discusses several possible directions for the future evoloution of the human species. It includes comments by Richard Dawkins, as well as several scenarios with pictures of what humans might look like in the distant future.
Social tagging: Biology > Environment > Genetic Engineering > The Future > Transhumans
Minding the Planet: Future Evolution of Human Species
Link: Minding the Planet: Future Evolution of Human Species.