Unless your the first one out, there will be no surprises. Just follow the thousands in front of you and then the thousands behind will follow you, etc, etc. It all works out splendidly. And to be fair, I think the final “official” route wont be out till July after the pre-ride is complete. I remember in 2018 they changed the route maybe a few days before the ride because of some major flooding near the Ledges. It always works out, one way or the other.