The electric truck maker just upgraded its manufacturing facility and is getting ready to roll out new models.There's no way to hide the plain facts: Rivian (RIVN -6.26%) management sees 2024 as a key turning point for the business. But if it doesn't achieve the operational goals it has set for itself, the future could be rougher than expected. On the flip side, if Rivian does hit its audacious goals, this electric vehicle maker's stock could quickly become very popular -- and could help to make you a milli ...