Of wider interest might be the authors' estimation of the autosomal mutation rate as 1.44x10-8 mutations/bp/generation. Of course, this might depend on the archaeological calibration used (where/when did the bottleneck in the ancestry of Native Americans occur?). It might also depend on recent evidence that Native Americans are of mixed origin and thus did not really split from CHB/JPT; only part of their ancestry did. Nonetheless, this is another fairly "low" autosomal mutation rate.
(This was previously released as a preprint to the arXiv).
PLoS Genet 9(12): e1004023. doi:10.1371/journal.pgen.1004023
Reconstructing Native American Migrations from Whole-Genome and Whole-Exome Data
Simon Gravel et al.