Pre-release rumours suggested a different tele lens. One post-release report that I read today stated that that wasn’t the case: only one lens has been altered to allow diaphragm changing.
The other thing that stood out for me about the new 18 version is that the multi-function exposing button/slider? has apparently gone, replaced by a single-function contact. Why anyone at iPhone imagined a photographer needed a complicated moment at his critical moment beggers belief. Some camera companies get crucified for being engineer biased and not as concerned with photographer requirements; it seems to be the general drift these days. Think cars: you need a fingerprint to engage with your car, you need the damned car to read the road for you and scream at you if you cross lanes? From my perspective, it looks like manufacturers have realised that instead of adding expensive chrome, they can add totally unnecessary functions simply to create buyer-perceived need, and milk the purchaser by over-complicating cars, cameras or even cellphones. Hell’s teeth, your camera needs few basics: a shutter, a sensor, a lens and a firing button. The rest of making a shot is supposed to be your photographic skill.