For example, in this thread, people keep saying that United States v. Ursery upheld Civil Forfeiture, but it did no such thing. The case was about whether CF is a criminal punishment for double-jeopardy, but it did not address the legality of CF itself.
In this case, they are also not directly deciding on CF. They are deciding on whether the 8th amendment applies to the States based on the 14th amendment. If they decide that it does, then the case goes back to the Indiana Supreme Court, who will have to decide if the fine is excessive, like the lower courts found.
But every other civil forfeiture case will still have to argue in a court whether the forfeiture counts as an excessive fine.