Its been rumored for a long time now and its most likely true that the next country to be added will be Brazil. At this point based on the accounts of many many sources its not a matter of if but when. therefore i think the real question is what would come after Brazil. from the suggestions here, Egypt definitively will not come any time soon A) due to its similarities with Moroccan culture and B) due to the recent overthrow of the government and political unrest in the country. India might have an opportunity because it is so unique however I agree with whats been said, since its already been represented in AK its chances in WS shrank tremendously. this leaves Greece and Russia which I would agree would both be great however both have some flaws. for russia, the traditional food options are less then to be desired and one of the keys of a WS pavilion is great food and lots of options. Greece has the issue of sharing a very similar history and identity with Italy however I definitely think it would be the stronger option of the two. the best contender however in my opinion hasn't been mentioned, Spain. Spain has one of the longest and richest histories of any nation, some of the best food in the world, tons of expensive great merchandise and great architecture to pull off of. I personally would love to see a tapas restaurant in the world showcase, it would be amazing and is usually fairly affordable for such high quality food. therefore in my opinion the order of added pavilions will be (since i believe at maximum there will only ever be 4 more). 1) Brazil 2) Spain 3) Greece 4) Russia.