As a number of commentators have noted, there is nothing new here. Stanford has been making this argument for more than a decade and it has been rejected by nearly all specialists in the field. This is a technical controversy however, and press reports cannot do justice to the evidence. John Hawks, a reputable anthropologist with a specialization in genomic evidence, will be giving the book a close read and will report his reactions on his blog. For now, though, he recommends a number of recent books on the subject that, taken together, will provide readers with a good introduction to the paleoindian controversies that have roiled American anthropology in the past decade.
If you are interested, check out his post here.