It's hard to say because there are so many variables. For instance, I don't think that the Disney Company as it exists today would even try to build Epcot. The original Epcot vision was about a positive look towards the future, a rather Utopian, if perhaps flawed, vision. Today's Disney is more interested in profits, and in the end, they would focus more on a park that would offer better tie ins with their other productions. If they were to still retain some semblance of future visions and world connections, I would expect to see more location based attractions - the sea, tropics and islands, rugged mountains, and space. I don't think you would have seen a separate Future World and World Showcase.
Assumi9ng that Disney did suddenly develop some interest in providing a more optimistic future vision, I think you would see something far more "earthy", more message driven. I would expect to see a lot of green architecture, much less emphasis on interesting architecture and instead a lot more theming. I would expect to see pavilions based around ecosystems and cultural awareness, I would expect more interest in continents and natural environments, perhaps more greenery and probably a much more meandering layout.
The interesting thing to think about, however, is what the original imagineers, with the original vision, would do in todays world. And that would blow our minds away! Today we are far more aware of technology - and also far more receptive to it. I think we would see fewer pavilions dominated by one major company with such a generalized subject. I would expect a lot more pavilions in Future World, with more interesting subjects such as computing and artificial intelligence, biochemistry, energy production, transportation, and communications. I thin it would be a lot more exciting, and probably, given the speed that our world moves in, a lot more dominated by an ever changing show of new products and technology. World Showcase I think would be a lot more adventurous - less dominated by Old Europe and covering a greater diversity of countries. I think you would see more rides, but I think you would see less involvement with governments and more involvement with corporations. This might a good thing, as it might bring in more exciting shops and attractions, but it could also mean a more commercialized, retail driven experienece.
