The Leipzig group’s interbreeding theory would undercut the present belief that all human populations today draw from the same gene pool that existed a mere 50,000 years ago. “What we falsify here is the strong Out-of-Africa hypothesis that everyone comes from the same population,” Dr. Paabo said.More information here and here. Update: the papers (open access); John Hawks comments.
In his and Dr. Reich’s view, Neanderthals interbred only with non-Africans, the people who left Africa, which would mean that non-Africans drew from a second gene pool not available to Africans.
Gaysian troll Catperson/Linda is on suicide watch after learning "there was probably interbreeding between Neanderthals and modern humans before Europeans and Asians split":