The 6S Plus follows the same metal style as the 6 Plus before it. Looking at the outside, it's hard to distinguish it from last year's model. They use the same casing design, though the 6S Plus uses new aerospace-grade aluminium, instead of the older aluminium casing.
One of the main new features on the 6S and 6S Plus is 3D Touch. It makes the touchscreen pressure-sensitive. Push in, and you can actually make things happen: new options pop up on the screen, offering you shortcuts without needing to actually go into an app.
The biggest upgrades to the iPhone 6S Plus are on the inside and in the software. The phone is powered by a third-generation 64-bit A9 chip that promise speedier performance. Also new is 3D Touch, a new way to interact with what's on the screen. Press and hold the display to call up a menu with app shortcuts and more.