I think it's reasonable to say that, given what little actual evidence we've been given, Pathfinder print products probably outsold D&D print products for one quarter. And that this trend may, or may not, continue into Q3. Paizo continues to put out a strong catalog of print releases, but WotC has picked back up again on its own release schedule (although not to previous levels, of course).
It's interesting, and likely a first, but ultimately, like others, I can only conclude, "so what?" At their best, our "data points" don't include the subscription sales for either company, and that is a major segment of each companies business model.
I think it's pretty unreasonable to conclude that total sales of Pathfinder have eclipsed total sales of D&D. I suppose it's possible, but absolutely no sufficient evidence has been provided to show this. And when crowing about your favorite system/company for a smug "I told you so", total sales are where it's at.
While some are genuinely looking at the news and saying, "Hey, that's interesting, let's talk about it (fairly)." Most of this debate is driven by the edition warrior instinct that has become so pervasive in our hobby. It's tiring, both here on ENWorld and when your local bookstore clerk decides to bring it into where you shop.
The only real facts are this: Pathfinder is a successful and awesome game. D&D 4E is also a successful and awesome game. Both companies have made mistakes in the design of their games and worlds, and both have made marketing mistakes . . . and successes in all categories also. Well, subjective "facts", but I'm good with that. I'll continue to play both as the moods of my gaming friends shift around, and continue not to care about the egos of edition warriors, as irritating as these threads can get.