I'll update the OP because this is what seems to be a commonly asked question.
- Finish all playable vehicle models
- Add in more incident variations like HAZMAT car accidents
- Technical rescue calls, specifically an underground entrapment.
- A big hurdle: Finish the advanced heal script. If so desired, this can be scaled back for a later release.
- Add lights to all units
- At a later date, replace the MHP and EMS helicopters
- At a later date, implement an alternate snow version of the map