I've noticed that the Rulebook Subscription issue for 2nd Edition currently does not give the option to begin with the next book, the APG. The only available options at the moment are the Gamemastery Guide and Bestiary 2.
(I apologize if something's wrong with the formatting of my post, like if it's too to the point and sounds off or this isn't the place for this, this is the first time I've posted to a forum in like a decade, let alone for Customer Service)