A higher level WDI cast member came to one of my college classes and did let some things slip about future resorts:
1. They looked into Australia and decided not to mainly due to small local population.
2. Dubai was actually heavily considered but Disney couldn't agree on a few things so that got scrapped.
3. Brazil is the most likely place for the next resort.
They already have two resorts in North America, three in Asia, and one in Europe.
The southern hemisphere hasn't been touched yet.
They know that they have the language problem, but they will use the same techniques they used in Paris.
Brazil is not located anywhere close to WDW. Shanghai, Tokyo, and Hong Kong are all much closer to each other than a Brazil resort would be to Orlando.