My first post ever since joining tonight.
As for predicting the sales of ps4, last holiday they sold over 4mil with only having launched stock. This year they won't have that problem.
Sony should have way more stock available and as we've noticed ps4 is super popular in row. With fifa, Destiny, driveclub, and more, Sony should be just under or right the 13 million sold Mark as the 10 million sold was back in early August at gamescom.
So now with all of August, September and now over half of October done, I'm predicting ps4 to be at 12.5 - 13 million by end of October. And for the US, Sony should easily sell 2 million for November and December each month. Same for Europe and rest of world for a total of 8 million consoles sold for this holiday season.
So by December 31, I'm predicting Sony to be at 20million sold. I see most of these coming from Europe as ps4 is like a god over there this gen. Just look up the insane ps4 launch vids from there last year and you'll see that predicting anything 15million or lower for this year is just ridiculous.