They're running the race in Northern Hemisphere summer (hence, Southern Hemisphere winter), which would make legs south of the Equator (ie Australia, most of South America, southern Africa),
highly unlikely. If they were to cross it, I don't think it would be for a giant leap (ie Oceania, South Africa).
That being said, I think they might go to Central America. It's been relatively unvisited plus they have TARLA racing down there to throw off any spoiler hounds like, say, us