An alternative theory to Out of Africa can be found at www.rafonda.com ... Ronald Fonda places the origins of Homo sapiens sapiens (modern humans) in northern Eurasia rather than Africa but his arguments are too lengthy to outline here so you will have to read what he says for yourself and make up your own mind.
Out of Africa has more problems - see http://phys.org/print364047660.html ... and the acrobats necessary to keep the politically correct meme alive and kicking is quite amusing. The latest torpedo is that modern humans have been found in China between 80,000 and 120,000 years ago - which will cause some alteration in the mapping of human migration. The Out of Africa theory is that all humans are descended from a pristine version of the human tree that first came to fruition in Africa. Subsequently, these modern humans left Africa 50,000 years ago.
The Denisova cave in the NW Altai caused a bit of a stir a couple of years ago when the tooth of an individual was DNA tested and found to be a new species of human, a sort of cross between Homo erectus and Neanderthals. Dates were provisional. These have now been more thoroughly ascertained and the finger bone and molar go back 50,000 years ago and a few other bones go back 110,000 years ago (just after the last Interglacial period came to an end).
It seems a more sober assessment of Homo naledi is now emerging after the media went over hype. At http://phys.org/print361434216.html ... more details have emerged and scientists, it seems, are not agreed if the bones come from apes or from hominids. See the cave diagram below - well out of the way for a drop in from above
At http://anthropology.net/2015/09/11/news-from-rising-star-cave-homo-naled... ... another story picked up by the media in general without a lot of thought about what was being said in the press release. The link above is an anthropology blog, and a post by one Tim Jones.
at http://siberiantimes.com/science/casestudy/news/n0356-fresh-discoveries-... ... and this time it is a skull and rib - dating back at least 50,000 years ago, or earlier. However, they also found a small piece of finger bone that is estimated to be around 35,000 years ago (in a layer above the skull).
An interesting piece popped up at http://popular-archaeology.com/issue/summer-2015/article/australo-melane... ... which seems to take a swing out of the Out of Africa theory (but then it turns out to be another variation on the same old). Modelling has been used - as in most everything scientific nowadays. Therefore the end result comes from the assumptions used by the modellers. For example, they know that Australo Melanesians were migrating into New Guinea and Australia a very long time ago (and that fact has always been a bit of a problem).
At www.eurekalert.org/pub_releases/2015-07/uoc--gap072115.php ... a genome study at the University of California-Berkeley has concluded Native Americans ae descended from a single migration from Siberia which they now date 23,000 years ago (purely on DNA evidence and assumed rates of divergence). From the perspective of neo-catastrophism this date is highly significant - at the height of the last Glacial Maximum.
Qiaomei Fu, a palaeo-genomicist (the study of ancient genomes) at a meeting in New York (see meetings.cshl.edu/abstracts/genome2015_abstract.html) said that her research team had found evidence of modern humans interbreeting with Neanderthals 40,000 years ago, in Romania. Evidence of genetic DNA from both human types in a single specimen is interesting. Is it due to co-mingling - or was something else going on? See http://phys.org/print350807146.html