This is just a big push by Sony to meet demand with Infamous coming out as well as trying to counter Titanfall. I reckon PS4 shipped numbers will be around 6.5m by the middle of February and will be up around 8m by the middle of March. So actual sales are very close to shipped numbers with a 500k margin.
I fully expect Titanfall to sell more XBones. I reckon we will see anything up to 500k increase on normal sales over the next 3-4 weeks, but we will see.
So maybe 6.5-6.8m for PS4 and 4.2-4.4m for XBone by end of March.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)