Mountain Lion introduces more than 200 innovative features, including the new Messages app, Notification Center, system-wide sharing, Facebook integration, Dictation, Power Nap, AirPlay Mirroring, Game Center, and the enhanced security of Gatekeeper. With iCloud built into the foundation of OS X, Mountain Lion makes it easier than ever to keep your content up to date across all your devices.
Apple has unveiled the 9th OS X update yesterday at the WWDC 2012 and it rocks. Especially the integration of messages and notification center make the Mac better integrated with your iPhone. AirPlay Mirroring and Power Nap are hot features as well.
OS X Mountain Lion will be available in July from the Mac App Store for $19.99 (US). The OS X Mountain Lion Up-to-Date upgrade is available at no additional charge via the Mac App Store to all customers who purchased a qualifying new Mac system from Apple or an Apple Authorized Reseller on or after June 11, 2012.
To learn about the new 200 OS X Mountain Lion features go here.