NPD charts. His latest report to IndustryGamers says to expect sales of Microsoft's console to be more than double that of its biggest competitor, the PS3, for December. Prognosticating that the Xbox 360 sold 2.5 million units last month, he's betting on a 91 percent boost in sales over November for Microsoft. As for the PS3, Pachter figures it sold 1.2 million units in December, a 12 percent dip compared to its performance in November.
As for actual real numbers, Nintendo boss Satoru Iwata revealed in an interview with Nikkei (via Andriasang) that the Wii sold over two million units in December. The DS reportedly performed on par with the same period in 2009, which would be somewhere around three million units.