“Somehow, it didn’t leak.”

When I caught up with Rivian founder and CEO RJ Scaringe after the company’s “AI & Autonomy Day” keynote on December 11 at its Palo Alto headquarters, he marveled that the company had managed to keep the event’s news under wraps until it was ready for its big reveal.

It did—and there was a lot to discuss. At the keynote, Rivian unveiled its Gen 3 platform, which will turn the maker of EV trucks,........

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