The way they ended with Bill looking up into the night sky. Barb mentioning that Bill was a pastor for 6 yrs. Bill under extrema stress, and fazing in and out. The writers have set Bill up for a spiritual experience.

I think he will be told to do several things including keeping Nicky(after she repents) and starting a church. Bill conversation with Barb after her excommunication where he says the Church is without leadership is significant. And as for Nicky, forgiveness is one of the major themes in "Big Love."