Just two months after being introduced, the third-generation 2012 iPad has managed to catch up to the market share of the first-generation iPad in the US, market analysis firm Localytics reports. The new model now accounts for over 20 percent of all US-based iPads, just over the percentage of active first-generation iPads. The iPad 2, released in 2011 and still available new for $100 less than its original price, leads the pack.