Investors are debating whether the release of the iPhone 6S will push Apple's iPhone sales past last years quarterly record (http://www.fool.com/investing/general/2015/09/18/2-iphone-numbers-apple-investors-need-to-know.aspx , http://www.forbes.com/sites/maggiemcgrath/2015/09/18/forget-ios9-glitches-iphone-6s-sales-will-boost-apples-results-says-wall-street/ ). The December quarter, which runs from 27 September 2015 through December 27, 2015 is the first quarter of Apple's 2016 year.