Basically, you'd need a sponsor from a particular country to approach Disney and Disney would need to agree. With that in mind, I think the most likely candidate might be Scotland, depending on how the booth fares at the F&W this year, as they approached Disney following the success of Brave (and the subsequent interest in Scottish culture). Yes, yes, I know that Scotland isn't a really a country and is technically represented in the UK pavilion, but remember, Africa sometimes gets represented as one homogenous mega-country.