While Rivian might have had a quiet year, with no vehicle launches until 2026, that didn't stop optimism from sending shares soaring recently -- here's why.Rivian Automotive (RIVN 7.96%) has had an interesting year, and it's featured two contrasting tales. On one hand, Rivian has been incredibly busy updating vehicle software and hardware for its R1 line, to pull out costs and improve profitability, while gearing up to launch its massively important R2 crossover early next year.On the other hand, with no ve ...