Scan (or reference local storage for) ID documents (e.g. license, passport) for voice assistance when you need to provide information from these documents.
Integrate with Google Timeline to assist with "where was I at/on ..." queries, or fine reconcilation (e.g. scan parking/traffic fine and receive information on who was likely to have incurred the fine based upon their whereabouts at the time - family members may be added to your account if they accept your invitation).
Easy access to documents using voice commands.
Google maps and weather (for sunrise/set) integration, parking?
Account for terrain when planning travel routes. Extend to buildings, does the building stairs have railing, lifts etc.
Future enhancements:
helpful wearables e.g shoes
Good parking spots
Medicine/Supplement reminder: For situations when you have meds that should be taken every x hours, set the duration and dosage. Have your phone alarm you when it's due. Integrate with pharmacy repository to look up effects and what the suggest dosages are if you forget.