Earlier this week, we saw hints of Apple's work on iOS 9.1 in the MacRumors visitor logs, speculating Apple had begun work on the update as a way to test features on the much-rumored 12.9-inch "iPad Pro" or the iPad mini 4 ahead of production. As it turns out, we were correct.
This morning, analytics company AppSee found an "iPad6,8" with a resolution of 2,732 x 2,048 in its logs. We asked AppSee to check what version of iOS the iPad had installed on it, and as it turns out, it's running iOS 9.1, suggesting Apple's work on iOS 9.1 coincides with the development of the iPad Pro.
iOS 9.1 on the large-screened tablet in AppSee's logs suggests that's the operating system the iPad Pro will ship with, which rules out the possibility of a launch in September alongside the iPhone 6s and the iPhone 6s Plus. Both iOS 9.1 and the iPad Pro will likely be unveiled at a separate event later in the year.
Rumors this morning have also suggested the iPad Pro will be entering mass production in September or October, pointing towards a late October or November launch date. It's possible Apple plans to stick to the same October iPad unveiling timeline it's used for the past several years, introducing the iPad Pro in mid-October and shipping it at the end of the month.
It is not clear what will be introduced in iOS 9.1, but the iPad Pro includes several features that could require a dedicated update, such as a pressure sensitive Force Touch display, a stylus, and a USB-C port that could support peripheral devices.
Apple's 12.9-inch iPad Pro will be the first major new addition to the iPad lineup since the iPad mini was unveiled in 2012. At 12.9 inches, it's significantly larger than the 9.7-inch iPad Air 2, and could bring a much-needed boost to Apple's flagging iPad sales.
