Pretty sure the insider was @marni1971I couldn't find the post, but one of the insiders once remarked that there were three countries for WS pavilions under consideration:
#1 was likely, but not finalized
#2 was possible, but not certain
#3 was being considered by very unlikely.
My assumption would be that #1 is Brazil, #2 is Spain and #3 could be any number of countries (maybe Australia or India?)