How about enabling the car to link to my home WiFi so that when my heavy metal garage door closes... the car still talks to the world as needed. Cost: HW likely almost nothing... probably already in the chips... SW costs moderate... Would make updating almost immediate while car is garaged at home, might also enable more updating / reporting error codes remotely with Nissan. Car could email or tell me when it needs to go to dealer and for what. Less code reading at dealer and more rapid effective solutions to problems.
Let me look at my all around cameras remotely via CarWings... let's me check on safety of car in public places. Motion alarm ideas come to mind... add motion sensors to logos on outside of car or mirrors and when folks disturb vehicle camera comes on and records for a few seconds... sends photos to app. May even alert driver in sketchy neighborhoods.
Show actual percent State Of Charge in the app. Likely already in next version.
How about an altimeter in the car with a CarWIngs report that helps you see the value of one route over another because of steeper hills etc... drive 2 routes to same locale... ask for report/ comparison of energy profile of drives... Does eco routing fully account for this?