While driving, the heat shouldn't be too much of an issue, if the mount puts it in front of a vent. But yes, you'd have to remove it and at least put it somewhere shaded when parked.
The stock monochrome red display on my versa radio has gotten so it's unreadable when it's just warmed up. on a...
Hawaii might be a special issue in getting them, since they would have to make special arrangements to get them there. The state government might actually want to encourage them because it would mean less dependence on shipped in gasoline.
One of the articles said the service centers would likely be one of the chains that starts with an "M" My understanding is the trucks are going to leave the factory as just the one base truck, I guess with the extended battery if you choose that. Everything else is going to be shipped in boxes...