Re: What to expect
The reason WHY Tesla as a startup managed to bring a completely new car to market is that, compared to a conventional car, an electric car is easy. (The safety architecture required to manage the battery is not, but this does not prevent the car from driving).
Tesla put together a decent drivetrain, and solved the range issue by simply using a LOT of laptop-size cells. After all these years, they have not managed to figure out how to make the (relatively simple) bodywork, and you suggest that they should go for an IC engine solution (The truly complex bit)? No chance.