New chapters of ‘AppleScriptObjC Explored’ are now available on-line at the book’s public Errata and Addenda Web site.
The new site will list changes and additions as they are compiled, before they are rolled into a free update of the PDF publication. You can find it at http://www.macosxautomation.com/applescript/apps/errata.html. The book is at http://www.macosxautomation.com/applescript/apps.