"What the different genetic studies across this region tell us is that the ancestors of modern humans appear to have met and mixed with four different archaic hominins, in at least six events. And this all happened in the very short window of time between leaving Africa 50-55,000 years ago, and arriving in Australia and New Guinea at most 5,000 years later. "
I expect more archaic hominins to be found.
Archaic hominims are the only kind there were. As the late J.A. West said, cultural, civilizational, and species progress is a sort of myth, drawing an upward line between "stupid cave men and smart old us with our hydrogen bombs and striped toothpaste."