A recent beta version of the iOS update revealed a little more than expected. An iOS developer recently found a new wayfinding arrow tied to the Maps application. Nothing exciting there, except he also found some code which advises the user to tilt their phone towards their face to navigate when in walking mode. The code also reveals that device cameras will be used in the mapping app.
More information: http://www.eventmanagerblog.com/ios-11-ar-events