(This was the San People news we had a few weeks back ~ well known all the way back to Niels Van Der Post's "Sands of the Khalihari" in fact).
At the same time various genes that appear to have popped up in East Asia and Western Europe have made their way back down the line into Africa.
People do get around don't they.
At this time in history all 14 lines of humans are members of the same species. Given enough time and genetic isolation its possible you could end up with 14 different species of modern humans.
The speculation concerning the Orangutangs has been around for most of a century. In fact, the "chimp thesis" wasn't all that well established until it was understood that the Bonobos were NOT the same species as the larger chimps (that tear your face off and eat your brains).
One variation on the human/chimp deal is the idea that modern chimps didn't arise out of the human/chimp milieu all at once but that genetic isolation was followed by cross-breeding, and then isolation and then more cross-breeding for several million years. This "blurred" distinctions, and also allowed for some back breeding with passing orangutangs ~ giving humans both chimp and orang relationships, without there being any strong chimp and orang relationships.
That idea is not new of course.
Perhaps specie was the wrong word.
But humans and chimps/orangutans are different species.
How did they cross-breed?
Why are there no fossils found of these ‘intermediate’ forms?