Almost started a new thread of my own speculation, but as we all know, repeated threads are hated here. Maybe as well try to get this off my chest.
Doubt anyone will read this but here's my speculation of the update.
I'll throw Backyard Monsters as comparison(note that this is a PC game so it's not a competitor game, so you can brush that forum rule off my face now) as it represents what I speculate accurately.
As we all know, we only have one base. It MIGHT not be alone after the update.
In Backyard Monsters this is your regular base.
After a certain point you can unlock this after successfully defending waves of monsters and defeating bases(similar to the goblin maps)
After completing the campaign you can now access a new base by entering the cavern.
These are my speculations about the upcoming massive update, the update will surely be far from identical IF it's a new village we can develop.
These are pure speculations as there are no sneak peeks out yet.