Rivian and Volkswagen Group have finalized a multi-billion-dollar joint venture to develop software, paving the way to let the German auto giant leverage the EV startup’s more technical chops in the coming years. Volkswagen will invest up to $5.8 billion by 2027, about 16% more than when the deal was first announced in June. Volkswagen Group has already made an initial investment of $1 billion in the form of a convertible note. The new joint venture — Rivian and Volkswagen Group Technologies — w...