I Think Humanity will branch off into three different Groups:
Group 1: Exypnos Anthropos or "Smart Man", will be the group of Humans who have Bigger Brains and thus continue to have Modern Human Socieities. They will be a bit taller, but also a bit weaker, but their technology will be 50 times more improved then ours.
Group 2: Ischyri Anthropos or "Strong Man", will be the group of Humans who have Bigger Muscles and will have a deformed form of Human Culture (It'll probably be a restart of Human Societies, like Roman and Assyrian Cultures). They will be a bit taller, but stupider, and will probably also be more persuadable. They could be more violent, but perhaps they'd make great workers and soldiers, but this could lead to the Smart Man using the Strong Man as their Paid Armies.
Group 3: Allaxe O Anthropos or "Changed Man", will be a group of both Smart and Strong Men who where Genetically Engineered (Literally, not what Genetically Engineering really means) by either their own want or through payment promises. They will differ from Man to Man: Some might have wings, some might have kitten parts, others might be just gelatinous blob monsters. Some might be accepted into Human Societies, but most will probably live on the fringes of both cultures, and perhaps they would develop their own.
Also Cyborgs, but they'll probably fit into the Smart Man Category.
(PS, I was Using Google Translator to create the Greek Names for the New Humans, so the Greek is probably incorrect)