Brazil has a lot of iconic architecture, and most of the styles would do a great job complementing the existing World Showcase pavilions. The capital Brasilia is home to some of the most iconic modernist architecture in the world, and Brazilian architect Oscar Niemeyer has lots of other similar-styled buildings throughout the country. Not-so-coincidentally, Brasilia was built right around the same time Walt was dreaming up EPCOT and the familiar Progress City images were createdBrazil's older cities have a mix of Portuguese colonial architecture and more contemporary buildings from the international style of design. This combination is pretty distinctive, and completely different from the other pavilions, which focus mainly on a single era of designAdditionally, the famous favelas are incredibly iconic, though I'm not sure if Disney really wants romanticized slums in the skyline of World ShowcaseAnd of course, the famous mosaic sidewalks would be easily recreated in a theme park environmentAlthough most people struggle to come up with a notion of Brazilian architecture, there are plenty of iconic elements to choose from. Much of it is a lot more modern than the rest of World Showcase, but it would also do a lot to diversify the visual styles on the existing horizon. I would also expect that they would incorporate the natural landscape in some form, similar to the mountains in Canada or the beach in Mexico