The holidays have always been very strong for Sony, and all platform holders really. It's always when we see a huge boost in sales and traditionally December used to take the overwhelming bulk of sales but in the past decade or so we've seen November and Black Friday become more and more important, even going as far as to take sales away from December. So with that said I still believe that December will be a bigger month in the U.S. than November but I'm not sure if we're going to see a huge increase like we used to during the PS2 era. So including Canada, I believe that sales in North America over November and December could reach 3.5 million units which would be remarkable. This would be up on PS2's 2001 sales of 2.8m during Nov & Dec 2001, but down on the 4m units sold during Nov & Dec 2002.
Europe & PAL regions have really increased their share this generation, and Asia is seeing huge growth in hardware sales compared to the PS3 and PS2 era. During Holiday 2001 the PS2 sold 2.7 million units in these regions and during Holiday 2002 the PS2 sold over 3.4 million. Both times the sales in Europe & PAL regions were less than North America. However I believe that the importance of these regions has grown in recent years and whilst PS4 holiday sales in these regions may not exceed North American sales, I would expect sales to be similar at the very least.
Japan was huge for the PS2 accounting for just under 1.2 million units during Nov & Dec 2001 and over 0.9m units in Nov & Dec 2002. Sales in 2014 weren't even close and were just over 200k iirc. I don't expect Japan to play any significant role in this years holiday sales and I don't much expect sales to be over that 200k by much.
Therefore I would say that it is very possible that Holiday sales for PlayStation 4 this year could exceed the 6.9m units that the PS2 sold in Holiday 2001. However I believe that the decline of the Japanese console market will be one of the reasons why the PS4 will not beat the Holiday 2002 record.
Then again I'm the same guy who said PS4 + XB1 wouldn't sell more than 2.2m in the US this holiday (they sold 2.8m) so I may be horrendously wrong again (haha)