Hence "sales rate"
That hasn't been updated in over a week. If you look at the weekly charts, you'll see there isn't one for the past week yet. They've been behind in updating it once holiday sales kicked in. PS4 has been in the top 20 in the hourly for several days now. I would assume it's close to the top 20 for the month now, if not actually in it.
As of this post, ps4 is now ahead #4 to #8. Will be interesting to see if it can remain there the rest of this week, at least.
2nd edit: Now that I'm not on mobile
Week 1 12/1 (AC XB1 #1, PS4 #39):
http://www.amazon.com/gp/bestseller...es/ref=zg_bs_tab_t_bsar?tag=viglink20241-20#1
Week 2 12/8 (AC XB1 #9, PS4 #31):
http://www.amazon.com/gp/bestseller...es/ref=zg_bs_tab_t_bsar?tag=viglink20241-20#1
Week 3 12/15: not available yet