Ahead of Apple’s announcement tomorrow, 9to5Mac is reporting the new iPhone 6S, iPhone 6S Plus and iPad Pro are expected to feature a next-generation version of the Force Touch display, likely to be called “3D Touch Display.” The new screens will be able to detect and act on three different levels of pressure — a tap, a press and a deep press. Sources said this improvement allows Apple to add new shortcut gestures to apps in the…