I don't really believe in "super-powers", just in human potential. I believe we can do many things that have not even been discovered, let alone explained. When we don't understand something we label it as "paranormal" or "supernatural." Just because we don't understand how or why something works, it doesn't mean it's magical or mythical.
Humans have awesome potential. The mammalian dive reflex is a good example of an amazing skill that can be developed. Echolocation is another great example of the potential skill that humans have. I have never heard of a sighted human using echolocation, but the blind humans that do have the same brain as you and I. So extra organs are not needed to have a special ability like that. We have them already.
So IF humans are born who can more easily train themselves to use the potential they have, then over time we will have have better humans. What if you could train yourself to use echolocation, or consciously tell your muscles not to fatigue so quickly, or make different areas of your mind communicate better, or purposesly shut pain receptors off? If you could do all that without the drawbacks, like having autism, that would be amazing. How do we know that more and more humans at the higher end of the curve will not appear? They may be around already. Since we cannot really set a limit on what a human is capable of, is it right to say that something is impossible?
We may not have any peer reviewed scientific proof of something, but that does not make it impossible or untrue. It's just unproven. We really don't understand too much of our own world, although we are learning. Why is it impossible to have "higher evolved" humans among us right now? Has human evolution stopped?
DD