They might just have made back, what they lost in gap, to the Xbox One those NPDs they lost earlier, this November.
And they won cyber monday, so their off to winning December NPD.
Then you start looking at the game lineup early 2017...... PS4 is going to keep winning until Scorpio releases, imo.
The gap might be the number of units that PS4 pro sold...
For example, Xbox one might have outsold PS4 if you exclude the newly PS4 pro, or PS4 without pro might have barely outsold xb1!
This is what I was getting at in my second point. If PS4 and XB1S were close, then even if Pro gave PS the 300k + lead or whatever it ends up being, it would look very concerning for PS and would prove MS has gained ground and may sit at parity with PS4 sales going forward. PS would rather keep that information behind closed doors if true.
PS may however also be working out how they want to show the numbers, broke up or all together, or potentially they are so comfortable they just dont care and dont see the need to kick MS while their down any longer.
The fact that PS4 is staying at $249 says to me that XB1 is putting up a good enough fight in NA that PS doesn't want to take any chances and is just going to keep their foot on MS's chest to make sure they stay down.