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D-Joe said:
http://www.gamasutra.com/view/news/40227/Analyst_questions_validity_of_unusual_January_NPD_results.php
The group confirmed to Gamasutra, however, that Wal-Mart POS data was not included in the January report, and thus did not affect this month's software sales figures.

so NPD starting include Wal-Mart this month?

NPD has always estimated Wal-mart numbers (with historic data, other means, and current trends). Still, the numbers are within 5% of exact sales, don't expect any magic additions to them.