For some reason I have a feeling like we will see Sam take over hell as the new king to fight god. Perhaps they will need to install a king to prevent more ghosts from rising or to retrap them. Sam as leader of Demons is the vibe I got when he crushed the last demon who went for it. Maybe he will become some lawful neutral punisher of the damn by the end of S15. Then maybe Cass would take over heaven again? Or Dean?

I feel like they are going to try to weaponize the souls in heaven and hell against god. The fact god keeps saying he barely understands them or whatever his line was leads me to believe they will figure out some way to surprise him. Or perhaps empower Jack with it since he somehow became a problem on the god magnitude scale.

Just some random thoughts since I binged watch S14 on netflix.