Shoot video in 4K
If you thought the "Shot on iPhone 6" campaign proved the 8-megapixel camera was a beast, the level of detail and quality you see with the 6S's 12-megapixel upgrade will blow your mind. It's also capable of shooting video in 4K, which will eat up a ton of storage space, but who cares when you have the power to shoot digital cinema-quality footage with the tiny device in your pocket.
Turn the keyboard into a touchpad
If you're fat-fingered like me and find it nearly impossible to move the cursor when you're trying to copy and paste in a text or email, the 6S has your back. When you press and hold the keyboard, it turns into a touchpad, where you can use your finger to easily slide the cursor wherever you want.