Meaning the game will take a place on a part of Kalos beyond the mountains, where new pokémon will complement the pokédex, and after the league you can challenge the next set of 8 gyms. after crossing the mountains.
They did it right in gen 4.
White Nuzlocke: http://www.gamefaqs.com/boards/2000300-pokemon-emerald-social/67324065 I endorse Permaculture
Perhaps it can be set somewhere taking inspiration from South America or Africa seeing as how Japan (Asia) The US (North America) and France (Europe) were the inspirations of Kanto, Johto, Hoenn, Sinnoh, Unova and Kalos. Maybe I'm not fully aware of diverse Australia is to pull off interesting Pokemon diversity but maybe throw that in there too.