The next step in evolution?

By now you have probably seen more than one article claiming that the next step in human evolution will be a kind of merge between humans and technology. Andy Clark's recent article "We are merging with robots. That's a good thing" (found here) is just one example. One of the interesting things about this claim is that it ignores one principle tenet of (Darwinian) evolution. Up to this point, most naturalists have assumed that evolution has been unguided. But, whatever will happen with humans as we become ever more immersed within and potentially merge with technology, it is certain that it need not be unguided. In fact, if we are thinking aright about these things, we will guide it as best we can.