For those interested, intelligence researcher Heiner Rindermann has a new paper in press:
Rindermann, H. African cognitive ability: Research, results, divergences and recommendations. Personality and Individual
Differences (2012), http://dx.doi.org/10.1016/j.paid.2012.06.022
In brief, he presents some new data, estimates the mean African cognitive ability, discusses the possibility of ancestral genetic differences, and offers some suggestions for future research.
After reading it, I wrote to him about my misgivings concerning a racial genetic hypothesis and referred him to a few of the discussions on this blog concerning the UK B/W gap. He thanked me and said that he would look into it.
With regards to that particular gap (or absence thereof) my qualms have not, in the least, been alleviated. The situation has turned out to be worse for a genetic hypothesis than I had originally thought. I might write a post summarizing my latest findings and thoughts on this or I might not.