I asked in the official UK owners group what functions should the new Tesla App have when 8.0 is released (or iOS app version 3), here are the answers:
The app lacks the following features (answers sorted in order of importance from the 80 UK owners that responded to my survey).
- Trip planning inside the app
- Disable the car remotely (e.g. Car gets stolen
- Cold weather controls (seats, front and rear window & steering wheel)
- Touch ID to unlock app
- Open/close sunroof and Windows fully
- Change charge schedule
- Change charging rate
- Live feed from cameras
- Warm battery up
- Data logging (like Teslalog)
- Driver profile switch
- Open/Close trunk
- Home automation support (IFTTT etc)
- Audio system control (so users in the rear could control music from the app
- Tesla publishes the API / JSON