When it comes to tracking console sales in the US, the PS4's monthly winning streak of outselling the Xbox One has been going on so long—since February—that it has ceased to become surprising (though we do still mention it occasionally). But it was a surprise when Microsoft announced that NPD data shows the Xbox One breaking that nine-month streak in November, outselling the PS4 in both the US and the UK.
Neither Microsoft, Sony, nor NPD shared specific units sales numbers for any of the systems, but GeekWire and The Verge both report sales of 1.2 million Xbox One systems for the month. NeoGAF user creamsugar, who has a history of leaking reliable NPD numbers, shared a cryptic, unlabeled pie chart that would suggest the PS4 (the second largest section of the chart) sold roughly two-thirds as well as the Xbox One for the month, representing about 800,000 units sold. These numbers are far from confirmed, but they are the best data we have at the moment.