What makes this story remarkable is that this same company predicted this would not happen until 2015.
Several years ago, technology research firm Gartner predicted Apple would maintain its hold on the tablet market until 2015. A new study from the company, however, shows Android taking a decisive lead: in 2013, it boasted 62-percent market share, compared to 36 percent for iOS. Google's mobile operating system climbed to the number one position thanks to more tablet sales overall, though Gartner also credits the proliferation of cheaper, smaller-screen slates (the Nexus 7 no doubt included) with establishing Android's newfound dominance.
Gartner: Android passes iOS to become the most popular tablet platform