You can swipe on it to adjust zoom level instead of having to pinch on the screen. Having owned SLRs I think I’ll appreciate the more camera-like affordances.

It’s also supposed to do the half-press to lock focus and exposure, which has been a common feature on cameras for ages. But I think I read this is a “coming later” feature.

There was something else about double tapping to switch modes though I don’t know how that works exactly.