Apple are saying they're on track to beat the 10 million pre-orders of last years launch. Considering there's still 6S stock available, they must really have a grasp on production.
It seems there's high demand for the Plus model
http://www.cnbc.com/2015/09/14/appl...t-last-years-iphone-first-weekend-record.html
Then it will beat that upon 7 release lol