6.7 million
Thanks.
Up to January 3rd/4th
PS4 WW sales - 18.5 millions
PS4 US sales - 6.7 millions
US | WW sales share - 36.21%
If the share stays the same
PS4 WW sales in January - February - 1.7 millions
PS4 US sales - 615,570
Given it sold 189,000 units in January, that would result in 426,570 in February alone...but that's way, waaaaaay higher than what can be expected, given historical MOM increases from January to February. But there's a a possible explanation.
Considering how last months of 2014 saw a US-specific phenomenon like Black Friday (it affected UK sales as well, but numbers were far lower for obvious reasons), as well as launch itself, I'd say it's possible US share is actually lower, more like 30%.
In that case
PS4 WW sales in January - February - 1.7 millions
PS4 US sales - 510,000
Which would result in 321,000 in February.
...Which is still higher than what can be expected in February, considering January's performance and MOM usual increases.
Probably, this means that US share on overall sales went quite down in the past few months, lower than 30% for sure.