I've been keeping an eye on preorders for several games to be released in those big months, looking at trends and listening to customer discussions. We don't have many preorders for the COD XB1 bundle, and the customers I've heard mention it are generally saying it is overpriced, just for a 'slightly' (their words) bigger hard drive. We have a surprisingly similar amount of preorders for the new CoD standalone for both PS4/XB1, though we do still have a lead for PS4 across my district.
Also, the MCC has a lot of preorders, it's going to be a great seller, but I've stated this before... from all the discussion I've had with customers, these are coming from people that already own the system, they've bought it at launch, or picked it up around the Titanfall hype, grabbed it on one of the big sales. It's been a very very small percentage of people hyped about the MCC that said they'll be picking up the system when that game drops. Which honestly doesn't surprise me, because the Halo fanbase by and large knew what system they'd need for the next generation of Halo. That's been a talking point since announcement.
These are just my observations, from my direct retail analysis and preorder data - The games trouncing preorder numbers for any and all exclusives are the 3rd Party multiplats, and in those, the PS4 has not lagged behind the XB1 on any thus far. I haven't seen any trends to reflect the momentum changing drastically enough to propel the XB1 beyond the PS4 for those months.
It's not that I don't think it is possible, anything can happen. It just doesn't really seem very likely.