We are giving players advance notice of this change to ensure Mac users have enough time to update their operating systems in preparation for the release of Patch 5.2: The Thunder King. We will provide an additional update when we no longer provide technical support for Mac OS X 10.6. Mac OS X 10.7 and Mac OS X 10.8 will continue to be fully supported per the recently posted Mac OS Support policy here. For more Mac-related information and help, visit the support site.
You can join the discussion in the Mac Technical Support forum here.