Apple OS X Mountain Lion Updater for Mac

This Apple OS X Mountain Lion Updater is recommended for all 13" MacBook Pro with Retina Display, 21.5" iMac (Late 2012) and Mac mini (Late 2012) systems.It includes all features and updates from OS X 10.8.2 Mountain Lion plus system-specific enhancements and fixes for Late 2012 systems.

New features include:

• Facebook
• Single sign on for Facebook
• Facebook as an option when sharing links and photos
• Facebook friends' contact information and profile pictures in Contacts
• Facebook notifications in Notification Center

• Share scores to Facebook, Twitter, Mail, or Messages
• Facebook friends are included in Game Center friend recommendations
• Facebook Like button for games
• Challenge friends to beat your score or achievement

• Power Nap support for MacBook Air (Late 2010)
• iMessages sent to your phone number now appear in Messages on your Mac
• From Safari and Mail on your Mac you can add passes to Passbook on your iPhone or iPod touch running iOS 6
• New shared Reminders lists
• FaceTime now receives calls sent to your phone number
• New sort options allow you to sort notes by title, the date you edited them, and when you created them
• Dictation now supports Mandarin, Cantonese, Spanish, Korean, Canadian English, Canadian French, and Italian
• The Dictionary application now includes a French definition dictionary
• Sina Weibo profile photos can now be added to Contacts

• An option to discard the changes in the original document when choosing Save As
• Unsent drafts are opened automatically when launching Mail
• Receive Twitter notifications for mentions and replies from anyone
• URLs are shortened when sending tweets from Notification Center
• Notifications are disabled when AirPlay Mirroring is being used
• SSL support for Google searches from the Smart Search Field in Safari
• New preference to have Safari launch with previously open webpages
• Graphics performance and reliability enhancements
• USB 3 reliability enhancements

See this article on how to verify the authenticity of this update.