The iPhone accounts for something like two-thirds of Apple's revenue, but you wouldn't know it from the way Apple introduced the iPhone 6S and 6S Plus at its product event today. The phones were fourth on a long list of announcements, after new Apple Watch colors and bands, the iPad Pro, and the new Apple TV and tvOS.
The 6S and 6S Plus (hereafter simply the "6Ses") build on the foundation laid by the iPhone 6 and 6 Plus, but no matter how interesting the internal changes are they can't really replicate the usefulness and obviousness of bigger screens. Apple is going to sell a lot of these phones, but it's fitting that they had such a low-key introduction—they're mostly subtle improvements, welcome but not really mind-blowing.
The S is for Subtle
To start, a list of the important year-to-year changes: