Wired reports on a symposium on The Future of Human Nature held in Boston. Somce scientists are concerned that we will modify ourselves into different species that will choose to kill one another. Personally, I think we already have enough differences to justify killing one another whenever we want to without reference to the artificial content of our genes. Perhaps greater diversity will lead to less contention rather than more as different human species contend for different resources.
Either way, I think the last generation of humans is coming quickly.