Don't you find it curious how the entirety of Soul Society seems to be Japanese in origin most of the time? For a place that is said to deal with souls from all over the world, such an isolating framework is bound to stall things a little... That will no longer be the case, though. Not once the female Shinigami acknowledge they are lacking something in their lives and start travelling to the West. And if her new uniform is anything to go by, then it's safe to say Rangiku will focus her efforts on saving and "guiding" foreigners' souls from now on.