From gaf leakers:
http://www.neogaf.com/forum/showpost.php?p=142899751&postcount=590
"Word from connected people is that the first two weeks of November was what won it for Xbone. PS4 nearly caught up thanks to BF and GTA bundles. Exciting stuff!"
Take it as a rumor for now, but if true that's truly something! I knew GTA would turn heads
The One and Only