I recently found 14 new Arabic fonts in Yosemite under Library/Application Support/Apple/Fonts/iWork Arabic Support. These must be installed manually before they become available in iWork and other apps. Some of them seem to have potential legibilty problems when viewed in this rudimentary Pages 5 test page:
Monday, February 2, 2015
Although Apple fails to say so in the notes for the update 10.10.2 released Jan. 27, this includes a fix for the bug in the Kotoeri Romaji keyboard which removed the ability to make accented characters like é by using the normal Option key shortcuts. This capability has now been restored, which should please users who want to write in W. European languages while still in Japanese input mode.