Thanks. I was hoping for something in English, lol, but I'm slowly working on it.
The gist is that the original finding (X was euro mtDNA) was the result of a sample size that was too small.
This study has a large sample size from most geographic locations. Result was that they found X in Africa, Europe, Asia and America. To me, the most interesting thing is that Native American haplogroup X is not closely related to any old World sample. They suggest dates for divergence not later than 11,000 ya and no earlier than 25,000 ya.