HW wise

Unhappily we don't have that much data yet. Even among the games that did came out this year, there was some i could not count for some reason (i explain better at the end).

There are 3 games that we can assume affected the sales without major interferences, here they are.

Tomb Raider:DE
- PS4
9.5k additional units or 6%
-XONE (still $500)
2k additional units or 2%

Gap: 7.5k units in favor of PS4

Watch Dogs
- PS4
70.5k additional units or 53%
-XONE (still $500)
9.5k additional units or 27%

Gap: 61k units in favor of PS4

Diablo 3
- PS4
13.3k additional units or 9%
-XONE (Kinectless)
5.3k additional units or 11%

Gap: 8k units in favor of PS4

---Pre Orders USA---

Watch Dogs Preorder (The week before)
PS4 = 415k
XOne = 270k

Destiny Pre-Order
PS4 = 874k
XOne = 710k

Games that were not included and reasons:

AC:IV / COD:Ghost - Launch period, too inflated. 
Rayman Legends - Sold poorly and was released during PS4 Japan launch.
Thief - Week after PS4 Japan Launch, both consoles sold less (Even XOne for some reason, despite PvZ release)
Ground Zero - Infamous release week. PS4 had a huge boost while XOne actually decreased

probably similar to the WD gap

Does ioi count the Destiny bundle?

4.5 million - PS4
1.26 million - Xbox One

Something like this, maybe?

almost 600k or even more

It'll be huge. It'll move a ton of systems all over the world (especially in NA and UK) and on top of that, given that the X1 is practically dead outside those two regions, Destiny is almost a defacto exclusive for the PS4. The gap will be massive.

This is the game that'll get things really rolling. As more people pick PS4 as their go to Destiny machines, these same people will carry over and bring their friends in for CoD, Farcry, AC, etc. This network effect is how the 360 dominated last gen and it's probably why MS is scared out of their minds. The NA gap should reach 1 million in a couple months. 

When it comes to popular shooters, the sales disparity hasn't been that big.

Look at BF4 or CoD:Ghosts. The PS4 has double the audience but the sales difference has only been about 500K.

I'm thinking EricFabian's prediction is reasonable based on what we've seen.

That comparison doesn't work because those are launch games which as the OP said, were heavily inflated sales wise. Plus, on PS4 those titles have KZSF to contend with, and we know that game sold pretty damn well. The PS4 didn't have double the audiance back in Nov-Dec. 

Basically, the more it sales on Xbox One, the larger the gap will be.

3:1 in favour of PS4.

Pre-order numbers added