I can't really see why this is news. I guess he could have checked more boxes, but if you read his books, he's always been pretty clear about this. I think what it meant to be a black dude with white mother coming up in the 60s, 70s and 80s, is a lot different than what it will be going into these next few decades. Even that last sentence will probably have to be written differently. More to the point, there probably will be a variety of meanings for a variety of people.