I think this has been known for some time. Right up until around the Neolithic Revolution much of the population of Europe was dark-skinned. Blue eyes I think originally appeared around Ukraine or the Volga somewhere, and then spread from there.
Interestingly (for some people!) the genes encoding pale skin in Europeans are different to those in East Asians. That's because when Homo sapiens left Africa they interbred with Neanderthal populations in Southwest Asia, but those Neanderthals were dark-skinned. So their Homo sap descendants remained dark-skinned, and eventually over thousands of years became paler-skinned to adapt to the light levels of Europe and Western Asia. However, as Homo sap spread further into Asia, there was another interbreeding event with a Central Asian Neanderthal population who were pale-skinned. Those hybrid kids who had pale skin did better in the low light levels, wouldn't so easily get rickets etc, and so from that interbreeding the East Asians inherited their pale skin. You can see that it's the same gene responsible as in Neanderthals. Europeans had to do it the long hard way and evolve it for themselves, so you can see a different gene at work.
There are a few examples of other genes, involved in keratin production etc, which have been inherited from Neanderthals across all non-Sub-Saharan African populations which have been selected for, however, although they don't have such obvious visible phenotypes.