I totally agree with you that from a societal perspective, there are already n number of humans. Different levels live totally different lives and have different thoughts and perspectives about everything and the disparity is so high that it seems like we are already "different humans".

What I was talking about in the article was from a much more biological perspective, where we will be able to do stuff to our bodies to differentiate from each other and from the next 'level' of humans and how it has the potential to divide the already divided society even more, this time from a biological point of view.

Great thoughts by the way :)