But to me, where you see safe I see refined. They focussed on building them better. They focussed on putting in the different radios, better/larger screen, while keeping consistent battery life. While making it smaller.
Just because there's no NFC (of arguable real-world usefulness, and I'm sure that's not what you're talking about anyways) doesn't mean its not innovative.
Apple doesn't really innovate on hardware features very often. They put capacitive touch in the mainstream with the original iPhone. They pushed HiDPI displays into mainstream with the iPhone 4. They redefined the tablet computer form-factor with the iPad.
Why change a great thing?