I’ve been looking at the design of the new Libra coin (LBR) in the updated Libra Whitepaper. Here’s what I think the differences are between this new “synthetic” coin and the previous iteration of the coin as described in 2019. Hope it’s helpful!
Note, this is just my attempt to explain it with the information that is available. It is probably still subject to change. If you’ve found it useful, feel free to share!