The new iPhones, named iPhone 6S and 6S Plus, are not lighter, thinner or bigger anymore. They instead feature a new display technology called 3D Touch, a derivative of the Force Touch technology used in Apple Watch.
According to Apple, 3D Touch will be able to differentiate between types of touches and taps in preloaded apps as well as on the homescreen. This new technology adds new functionalities to iPhones; for example, applying a little extra pressure on the screen may preview a photo in one app and open a file in another.
3D Touch will deliver information like time taken in the journey in the Maps app with a force-touch, while a light tap would only bring up the directions. This display technology would also make it easier to navigate through apps; for example, you will be able to see all active apps with a long-press at the edge of the screen.
The screen size and resolution of the two models will, however, remain the same as that of their predecessors: 4.7-inch HD screen for iPhone 6S and 5.5-inch Full HD screen for iPhone 6S Plus.