The outer part of the new home button is exactly the same size as the Phone and passcode keypad number circles in iOS 7, which are in turn also identical in size to the holes in the back of the new iPhone 5c rubber case.
He noticed a lot more things too, which to me speaks worlds to having “one” man in charge of all design. Consistency of design is very important, and though few would notice this sizing, we all unconsciously notice these things. It makes a difference, just not a directly quantifiable one.
“Slide to unlock” on the lock screen no longer makes sense when you’re using a fingerprint to unlock.
I do find that odd. Obviously you can still unlock your iPhone with a passcode1 when you have Touch ID turned on, but it seems odd to see “slide to unlock”.
If you are using Touch ID and you do attempt to slide to unlock you are only slowing down the process of unlocking your iPhone. I assume the reasoning behind this staying in place is to maintain a sense of familiarity for users, but I fully expect this to change at some future point.
Make it a complex one though now that you have Touch ID. ↩