Nowhereelse.fr has apparently managed to get a hold of the "official illustrated guide to the iPhone 5S". Check it out. It looks like there's a fancy new home button featuring the "Touch ID" sensor.
It's just a few hours away, so there's really no way to tell if this is real just yet, but it would confirm the rumored silver rim around the home button.
[
Nowhereelse.fr via
Cult of Mac]