Regarding the identity of a new ("likely") WS pavilion, I find it interesting that our insiders are particularly tight lipped without any hints. At least none that I recall. I feel like that might indicate that no one is close to guessing it right and that the pavilion will be something totally different than anyone is predicting.
That said, Brazil makes sense and there's even been concept art for previous blue sky plans, but I wouldn't be shocked if they used another South American country (maybe Argentina) if they wanted to represent that part of the world.
I thought @marni1971 basically already spelled out it was Switzerland somewhere. With Brazil in the maybe category. Potentially Australia as the unlikely.