Every time in the past when Apple did something successful (Mac, iPod, iPhone, iPad), they were pretty much the first to successfully do it. The iPod, for example, wasn't the first modern mp3 player, but was definitely the first "awesome" mp3 player that became popular. Same with the iPhone and the iPad.
With the electric car, we already have a popular, "awesome", and successful company doing it, Tesla. This has never really been the case before with anything that Apple really succeeded at. Tesla is to the modern car what Apple was to the iPod and iPhone. This is the first time that someone has really nailed it before Apple, which makes me wonder if the Apple car will just be really similar to a Tesla with some less significant differences. I'm sure that if Apple makes this car, it will probably be great. But I doubt it will be as revolutionary or legendary as any other successful Apple product has been. It might just be an alternative to Tesla.
One thing is for sure: the Apple Car will be expensive. Personally I wish electric cars became as cheap as possible so that everyone ended up getting one eventually. That would be the only way it would benefit the environment. If only rich people drive electric cars, then who cares? Rich people could afford fuel anyway, so it won't benefit them. Rich people are only 1% of the world, so it won't benefit anyone. It's the poorer people who would benefit from a car that has low maintenance costs that runs on fuel that's almost free. And since there's more poor people than rich, it would also benefit the environment more to make a cheap electric car. Tesla is high end, and Apple will be high end. Who will make a cheap car?