Developer Hamza Sood has managed to find some Force Touch code in iOS 9. Sood posted a screenshot of an 'enableDeepPress' function to Twitter earlier today.
Some force touch code in iOS. Looks like they’ve tested kb trackpad gestures on the 6s, activated via force touch
It's been widely rumored that Apple plans to bring Force Touch capabilities to the iPhone 6s. A recent report suggested that rather than opening up new full screen windows to display extra controls, Force Touch on the iPhone will be used to skip existing lists of options or presses.