Preview at WWDC likely in June, followed by September launch.
OS X Mountain Lion Launching Tomorrow, July 25
“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 will be priced at $19.99 and will be available via the Mac App Store.
Apple followed a similar tactic last year, announcing at the start of its July earnings conference call that OS X Lion would launch the following day.