Coincidentally or not, iOS 9 has introduced a trio of notable enhancements in the multi-touch department that could be viewed as laying the groundwork for a rumored Apple-branded stylus thought to arrive later this year alongside a larger twelve-something-inch 'iPad Pro' model.
As one of the WWDC 2015 session videos details, the Cocoa Touch framework in iOS 9 has gained brand new predictive touch capabilities. Not only that, but iOS 9 now has a drawing engine and features vastly improved multi-touch performance, a significant boon for apps that let you draw with your finger or a stylus.