There's limited (specs) info on the Rivian site probably since it's still over a year away from launch. You can find a lot more details in the reveal from Spring 2024 here:
I also have pre-orders for both Rivian R2 and Scout Traveler. At some point the Rivian R3 and R3X are also going to be available for pre-order and I might do the same with the R3X if the details align well with my needs and wants.