Some days ago, I commented on a couple of news articles that fed on a paper of D.M. Behar on the ancestral mtDNA lineages, that suggested a marked bottleneck or divergence in Middle Paleolithic Africa.
Now Jon Hawks extensively discusses on his blog about this, as apparently it Behar's conclussions are largely based on his own research. He is in total disagreement, to put it briefly. But in any case it's worth a good read, as it's almost like an informal research (public notes, thinking loud...). And he is promising more interesting stuff on the same issue.