Whilst it may well be in overdrive, the truth is there's not much to see here. A minor increase in device thickness to allow for Force Touch and to fully encase the camera lens being the only notable changes.
Given this is an 'S' model upgrade it isn't surprising, and we're used to seeing specification upgrades annually with overhauled devices every 2 years.
Here's what we've collected from the web so far:
We'll continue keeping the Proper community informed as we learn more in the lead up to launch.