Apple reported fiscal 4Q15 results after market close yesterday, and investors reacted positively (Apple is currently up +1% in the premarket). While the quarter's results were largely in line with investor expectations, investors were generally positive on Apple's 1Q16 guidance for positive iPhone revenue and unit growth. However, many investors remain concerned that growth could decline the rest of the year in fiscal 2016. A key question going forward will be whether Apple will be able to grow iPhone units and revenue in 2016 on top of the highly successful prior year.

Apple reports earnings next Wednesday, October 27th. Here are the key discussion points among professional investors.