There are 8 new features in particular that Apple highlights right on its iPhone 6s landing page.
The next generation of Multi‑Touch: All new iPhones have one flagship feature, and Apple’s new 3D Touch technology is the star of the show this year. New hardware in the iPhone 6s and iPhone 6s Plus allows the phones to recognize how firm you press on the phone’s screen.
12-megapixel photos: “The world’s most popular camera is more advanced than ever,” according to Apple.
4K videos: The new iPhone 6s and 6s Plus feature 12-megapixel main cameras that can also record video at 4K resolution, making them the first ever Apple products that shoot in ultra HD.
Better Touch ID: The new and improved Touch ID scanner under the 6s and 6s Plus home button is twice as fast as last year’s fingerprint sensor, which was already the fastest available on any smartphone.
Faster LTE: LTE Advanced support means the iPhone 6s and 6s Plus support data speeds of up to two times the speed of standard LTE.
Faster Wi-Fi: Apple’s new iPhones pack 802.11a/b/g/n/ac Wi‑Fi radios with MIMO.