According to Nowhereelse.fr, this is a photo of the iPhone 5S user guide. The pamphlet shows an iPhone with a gray ring around the round home button, which matches previous descriptions of the iPhone 5S’ fingerprint sensor. The guide refers to this button as a “Home Button/Touch ID sensor”. This suggests that Apple will brand the 5S’ fingerprint sensor clearly as a means of identification.
This corroborates with 9to5Mac’s reporting. We have said on multiple occasions that the fingerprint sensor will likely only be used as a means of unlock. In our roundup, we describe how the system will work:
To unlock the iPhone with the fingerprint reader, an iPhone 5S user simply clicks and holds their finger/thumb down on the sensor for a few seconds. It is unlikely that the sensor login and passcode could be used in tandem. There will be a preference in the iPhone’s Settings app to disable the sensor.
This description of the process pairs nicely with the branding ‘Touch ID’, as it literally describes what happens; unlocking will be activated by a touch-and-hold of your finger on the Home Button.
It should also be noted that this guide matches the leaked user guides for the iPhone 5C, with the same color-matched wallpaper design.
Apple will formally announce the iPhone 5S and iPhone 5C at its September event, scheduled for 10 AM PST. Banners at Apple’s Town Hall, the venue for the announcements, went up yesterday.