The question about human evolution really has two most likely answers. As long as we live here on Earth it is unlikely we will ever notice evolved humans in any given population. It is possible that we might be able to see enough difference between samples separated time wise by many hundreds of thousands of years that would be large enough to classify the earlier and latter humans as different species, or if there was some major selection like the scenario you describe.
But the more likely example would be if we ever colonize other worlds. In that case we might see a relatively rapid evolution into two entirely different human species simply because each population would face quite different selective pressures and the distance are large enough to preclude ready interbreeding.
Anyone so limited that they can only spell a word one way is severely handicapped!
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