hard month to predict.
ps4 could be anything between 350 and 500k
xb1 could be over or below 300k. both is not unlikely
hard to guess month
i still go with
435k ps4
305k xb1
ltd so far:
3944k ps4
3204k xb1
so still no 1m lead for the ps4 in the us.
maybe ps4 can manage to do that on december npd.
but not before...
edit:
would be funny, if x360 outsold wiiu :O