To sum up what the current findings are, "Implicit in this research is the assumption that the geographic locations of people today are informative about the geographic locations of their ancestors in the distant past. However, it is now clear that long-range migration, admixture, and population replacement subsequent to the initial out-of-Africa expansion have altered the genetic structure of most of the world's human populations. In light of this we argue that it is time to critically reevaluate current models of the peopling of the globe, as well as the importance of natural selection in determining the geographic distribution of phenotypes."
Pickrell, J. K., & Reich, D. (2014). Toward a new history and geography of human genes informed by ancient DNA. Trends in Genetics, 30(9), 377-389.
http://www.sciencedirect.com/science/article/pii/S0168952514...
http://biorxiv.org/content/biorxiv/early/2014/03/21/003517.f...
To sum up what the current findings are, "Implicit in this research is the assumption that the geographic locations of people today are informative about the geographic locations of their ancestors in the distant past. However, it is now clear that long-range migration, admixture, and population replacement subsequent to the initial out-of-Africa expansion have altered the genetic structure of most of the world's human populations. In light of this we argue that it is time to critically reevaluate current models of the peopling of the globe, as well as the importance of natural selection in determining the geographic distribution of phenotypes."