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Evolution does not go "one way"; it will not be a single new species, it will be several deviations. Knowing man, we will treat them as being sick, and will try to "heal them".
Currently, we are evolving to use less brain-power; machines are getting easier to control, and most of the complex tasks are done by machines. Less real interaction between people has a similar effect. Since most of us don't have to do hard labour, future generations will be less muscled. Probably huge-dicked[^], weak, idiots with immunity-issues.
Personally, I, or my descendents, would expect to and up as a Morlock as I would hopefully be in the underground bunker come the nuclear apocalypse.
I ain't havin' any, but if there were, I'd raise them as predatory problem-solvers, not as pigs with an attitude
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
Kim Stanley Robinson wrote an interesting science fiction trilogy called the Mars series: Red Mars, Green Mars, and Blue Mars, I think they were. It is about the colonization of Mars by humans and he postulates that humans will evolve into hybrid species because of the low gravity. It's a very good series I think and he has won awards for it.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
In SF various human subspecies often evolve under extreme environments, or through genetic manipulation, but it's harder to find stories with different human species that couldn't interbreed.
A couple interesting subspecies include the Quaddies from Bujold's Vorskogian Saga series- deliberately created for zero-G, with four arms and no legs. Now 'obsolete' with the invention of artificial gravity. Also the human variants from Niven's Known Space series - 'We Made Itians', Jinxians, etc.
I found this article by Larry Niven talking about the evolutionary themes in his books. It's fascinating to see the whole sweep from the Slavers and their food yeast, to the Pak, and the Puppeteers project to secretly influence human evolution.
SF & Fantasy writers usually call it "Worldbuilding".
Long ago, my wife was running a general book discussion at a library branch, and the members hadn't read any SF, but were interested in trying something different. I suggested "Ringworld"
They all finished the book, and it wasn't the generic space opera they were expecting. Quite a lively discussion with the different themes, and they were fascinated by the different characters, like Speaker-to-Animals and Nessus.