Speaking during MWC 2015, Ghosn said that it would be good for Nissan, and other car companies, for Apple to build a car. An all-electric vehicle from Apple would raise public awareness about electric vehicles. From CNET:

"The fact that a company outside of the auto industry wants to do electric cars is refreshing," he said, adding he was curious about the prospect.

Apple has reportedly been building a team of car experts for an automotive project, and is rumored to be targeting 2020 for the release of an electric vehicle.

Source: CNET