All next-generation Apple devices, including the rumored iPhone 6s, will have Force Touch technology by the end of this year, according to 9to5Mac. Sources have confirmed that Apple has "designed iOS 9 to be Force Touch-ready" and the iPhone 6s will ship with a Force Touch display with haptic feedback.
Force Touch is already available on Apple's Watch, Retina MacBooks and MacBook Pros. The feature will replace the long-press action used on iOS devices to complete tasks, like dropping pins in the Maps app, and so on.
Apple is also expected to roll-out an improved stock keyboard in iOS 9. The company is allegedly testing various new keyboard designs and features, including a longer version for portrait mode, a better QuickType experience and even an updated Shift Key.
Other leaks from 9to5Mac have suggested that the iPad will receive dual-app support, multi-user log-ins, a "Home" app for controlling HomeKit products, and other upgrades and improvements, but not all iOS 9 features will be unveiled at WWDC 2015.
Apple is expected to launch iOS 8.4 and preview iOS 9.0 at WWDC, which runs from June 8 to June 12 in San Francisco, California. Other rumored WWDC announcements include a new Apple TV, a possible iPad Pro unveiling and the debut of Apple's redesigned Beats Music streaming service.