I did not read these, but it appears that the case for East Eurasian mDNA in Neolithic Hungary may in fact be suspect.
‘Early Neolithic’ graves of the Carpathian Basin are in fact 6000 years younger—Appeal for real interdisciplinarity between archaeology and ancient DNA research
Eszter Bánffy, Guido Brandt and Kurt W Alt
J Hum Genet advance online publication, June 7, 2012; doi:10.1038/jhg.2012.36
Response to Data on Hungarian Early Neolithic graves by Bánffy et al
Tamas Zeke and Zsuzsanna Guba
J Hum Genet advance online publication, June 7, 2012; doi:10.1038/jhg.2012.64