Reunite? In what sense?
I'm pretty sure that the tribes will meet again, face dangers together and fight them together. And that Cutter and Leetah will see hergrandchildren from both sides - if nothing REALLY bad happens to Ember *remembers teaser pic*
Reuniting for real as one big tribe and with Cutter as chief of all? I don't hope so. This could mean:
- Ember, the blood of eleven chiefs is killed. Then Cutter would take over pretty sure (especially when there should be no cub)
- They reunite because (almost) all elves have to leave Abode. I think Ember would give up the chiefs knot in this case and Cutter leads
But I'd prefer them staying two differrent tribes with different ways and developement. Tribes that meet, support each other and part again.