"Mission: No R talk until Retrouvaille in 8 days."

Watch out, don't get fooled! I'd say very little even at Retrouvaille until I were sure W was indeed there with the right motivation/hope to save the M. They can easily get thru' the screening (often by lying) but show up with some other motivation, e.g., making it easier to get D, learning to stay friends, to co-parent better, ... One of the prereqs is that both spouses not have an OP, but they can lie about that too. While your "hope" might seem like a good thing it often isn't - when you somehow drop the "hope" (or is it the "rope") and actually have zero expectations that's when only in a few cases the WAS begin to turn.