Key TakeawaysRivian introduced three new models to its electric vehicle lineup.The Rivian R2 is a mid-sized SUV, while the R3 and R3X are mid-sized crossovers.The R2 is set to be priced at about $45,000, while the R3 and R3X will be less.Rivian shares jumped 13% on Thursday, though are still down more than 40% since the start of the year. Rivian Automotive (RIVN) shares jumped 13% Thursday as the electric vehicle (EV) maker introduced three new models to go along with its RT1 truck and RS1 SUV, as well as i ...