@Jordan Well I'm actually not that fluent in Japanese
(I'm more fluent in Chinese, Spanish, and French, in case translations from these languages are ever needed), so I guess I won't be of much help. But from what I can understand, this interview was mostly about the history of GT, especially on the factors that inspired Kaz in creating the first Gran Turismo. Kaz was mostly emphasizing his "innovative thinking" at the time, along with other stuff we already learned from previous interviews and Kaz (the documentary). He also mentioned the concepts behind the course designs (presumably the original courses).
Towards the very end the interviewer did ask about the future of Gran Turismo on the PS4, specifically whether he'll be able to achieve what he has in mind, or if he'll be focusing more on taking advantage of the capabilities of the PS4, to which Kaz answers vaguely, something along the lines of "I can't say much since I have different mentalities while working on each title" (typical Kaz...). He believes that the answer will "come along naturally".
Kaz was also asked about what he expected from working with the Ps4, to which he responded something along the lines of "There are more risks".
As I am at school right now I did have to skip many parts to save time, so I may have missed some things. Plus, again, I'm not a native speaker, so it's better to confirm with native speakers like
@shirakawaa.