It's evidence that the game had a lot "next gen hype" and that the Playstation marketing was effective.
The "next gen hype" helped in terms of PS4 sales too since the PS4 was the cheapest new system to play the game.
PS3 only went down from 25 to 17%
360 went down from 27 to 14%
Xbox One only has 17% of next-gen sales.
To me, this, along with other evidence we got over the past couple of months, this indicates that a lot of 360 players moved to PS4, while PS3 players largely moved to PS4. It also seems to indicate that 360 players were more eager to jump to next-gen, and jumped ship in the process.
Microsoft is being super aggressive with trying to regain market share right now, with the titanfall exclusivity being bought for the life of the title, the Gears of War announcement, the policy reversals, the aggressively priced bundles, and now dropping Kinect, on top of the potential "controlled leaks" (I'm not really believing that, but who knows).
With these numbers, it's starting to make sense. I don't think they're too happy with the XBO software sales numbers, which are the bulk of the profit they make, not hardware sales. Software sales is what really matters.