Force Touch Display
The iPhone 6s and iPhone 6s Plus could get a major upgrade with Force Touch. Currently you can only tap and long tap on the iPhone 6 screen, but with Force Touch you could also hard press to use another set of options.
Apple includes Force Touch on the Apple Watch and it is part of the trackpad on the MacBook and new MacBook Pro Retina 13-inch.
On the Apple Watch users can Force Touch to clear all notifications, switch inputs and more. It is an excellent way to reach other options or perform other activities without the need for another button.
Kuo shares this rumor and it is one we've heard before from various sources.