As part of Apple’s Q3 earnings press release today, CEO TIm Cook has announced that OS X Mountain Lion will be launching tomorrow, available only in the Mac App Store. We’re thrilled with record sales of 17 million iPads in the June quarter,” said Tim Cook, Apple’s CEO. “We’ve also just updated the entire MacBook line, will release Mountain Lion tomorrow and will be launching iOS 6 this Fall. We are also really looking forward to the amazing new products we’ve got in the pipeline. OS X Mountain Lion is set to cost $19.99, down from the previous $29.99 for OS X Lion and Snow Leopard.