Future world is at the front of the park around the large "golf ball" and is where all of the "rides" and real attractions at Epcot are located like Test Track, Soarin, etc. World Showcase is in the back part of the park surrounding the water. I think World Showcase opens later because it does not have any real attractions or rides to speak of (do the water rides in Mexico and Norway count, really?). The nations' pavilions are focused on exhibits, shopping and food (restaurants). They are'nt set up for breakfast so there really isn't much point to that park opening up until about lunch time.