This is interesting both because it's a >12,000 year old skeleton from the bottom of the sea (!) and because it establishes that an individual with clear Paleoamerican morphology belonged to a common modern Amerindian mtDNA haplogroup. Together with the recent publication of the Anzick genome, it seems that everything points towards continuity of Native Americans since the earliest settlement, rather than a more recent arrival of the ancestors of Native Americans that replaced an earlier "Paleoamerican" gene pool.
Science 16 May 2014: Vol. 344 no. 6185 pp. 750-754 DOI: 10.1126/science.1252619
Late Pleistocene Human Skeleton and mtDNA Link Paleoamericans and Modern Native Americans
James C. Chatters
Because of differences in craniofacial morphology and dentition between the earliest American skeletons and modern Native Americans, separate origins have been postulated for them, despite genetic evidence to the contrary. We describe a near-complete human skeleton with an intact cranium and preserved DNA found with extinct fauna in a submerged cave on Mexico’s Yucatan Peninsula. This skeleton dates to between 13,000 and 12,000 calendar years ago and has Paleoamerican craniofacial characteristics and a Beringian-derived mitochondrial DNA (mtDNA) haplogroup (D1). Thus, the differences between Paleoamericans and Native Americans probably resulted from in situ evolution rather than separate ancestry.