So I was playing through the 2 available maps and it occurs to me, some plot devices would really drive this addon! Like, why are we going to Container Town? It could be anything from needing to obtain shipping records to finding a little girl's teddy bear, or even just to recon the situation to see how bad the town is still overrun. Some little plot device in these campaigns - and they could be standalone "side quests" or some could have references or connections to others - would add a lot to the already epic hub.