John Gruber sheds light on some fine details of the new iPhones. First the Trackpad Mode:
Press on the keyboard and it turns into a trackpad. iPads running iOS 9 can trigger this trackpad mode, too, with a two-finger swipe on the keyboard. Doing it with a single finger on the iPhone, though, is a tremendous boon to text editing. This might be the single best new feature for text editing on the iPhone since the addition of selection and copy-paste in iOS 3 in 2009. In addition to moving the insertion point around, you can press again and switch to selection mode — like double-clicking the mouse pointer on a Mac. Trackpad mode is a once-you’ve-used-it-you-can’t-go-back addition to iOS.
Here is it in motion. On peek/pop:
[y]ou can drag a message up to get an activity sheet with additional actions, like Reply, Forward, Notify Me, and more. (…) Once you get used to it, peek/pop is as intuitive as the shutter button on a camera, where you can press halfway to engage autofocus and set the exposure, and press the rest of the way to take a picture.
On the new Touch ID:
[t]he new Touch ID sensor as “up to 2× faster”. They’re underselling it. It’s so fast now that every single time I press it, it unlocks the phone, no matter how brief the contact is between my finger and the sensor.
It is stronger, more noticeable, and in my opinion more pleasing than any previous iPhone vibrator.
This sentence could’ve been so much better without the word “iPhone”.