Nothing yet, but...
How Rivian's vehicle trade-in program should work is through a third party. I think its the best starting point for them as a new automaker in order to minimize the downside and have even more of a competitive edge.
Tesla, Ford, GM, and more are all entering the segment and around the same time. The last thing Rivian wants to do is make the purchase process any harder than it should be.
Maybe one of us can reach out to them?