cool. Let me help you out. I'm fairly certain on all four questions. Yes, I'm a know it all.
first of all, tesla WILL show the exterior of the car. The physical car on stage. They probably won't focus on the interior styling. But exterior styling will largely be the actual styling of the car when it launches next year.
To your questions:
1). IMO. Absolutely supercharging will be included on all model 3's. No cost... Included
2). Supercharging will be FREE for long distance travel.
3). All Model 3s will have the AP hardware. May be a fee to enable it on the car, but I doubt it. Industry is going to autopilot and safety related MANDATED features like TACC and collision avoidance (steering) and auto breaking in evident of collision. So, Tesla will have highway autopilot for free but possibly charge for a "city street" autonomous version.
4). Simple. Tesla needs a 200mile range version and a 300mile version. The 200 mi range will be ~50 kWh battery and the >300mi range around 65-70 kWh battery.