As a senior project manager in a car company, Kim said he worked for Model 3, S, X and Y together with the Roadster V2 and Semi. This background, along with the chief engineer Tesla car has recently returned to Apple and the company's latest recruit other former employees of Tesla, may indicate that Apple is trying to re-build your own car. However, given the breadth of the experience of Kim, there's no real telling that he is likely to be in the spotlight.
Apple's, as Apple, Jony Ive, probably still hold power over major design decisions. But the idea of adding someone as obviously talented as Kim in the mix can only prove beneficial for the future of Apple products.