Now that we know Leg 1's in Rio de Janairo, I'm gonna speculate that the route would probably go like this:
Leg 1: Rio
Leg 2: Rio or somewhere in Brazil?
Leg 3: Europe?
Leg 4: Europe?
Leg 5: Europe? Africa?
Leg 6: Europe? Africa?
Leg 7: Europe?
Leg 8: Asia? India?
Leg 9: Asia?
Leg 10: Asia? China?
Leg 11: Asia?
Leg 12: USA
I'm gonna speculate that they might have taken off Australia, but we'll just have to wait and see.