Assuming that we are a bit under a month away from the announcement for the new iPad mini Retina, that would put us safely in the window where Apple has already ramped up production in order to meet demand when the device actually hits store shelves. It is widely assumed that the September 10th event will be iPhone 5S (and probably iPod) only, leaving the iPad mini Retina to an announcement later in September...
Source: http://www.phonearena.com/news/Apple-producing-iPad-mini-Retinas-at-similar-volumes-to-original-iPad-mini_id46442
Source: http://www.phonearena.com/news/Apple-producing-iPad-mini-Retinas-at-similar-volumes-to-original-iPad-mini_id46442