I highly doubt they will do this, but it would be nice if they did. Especially for worlds like Mt. Komorebi where there is a big difference culturally and the sims wear uniforms to school. It seems to me that all sims will go to Copperdale. But I'm not sure if they'll have all teen sims from all worlds appear there when you're actively attending school, or only random ones like when you're traveling to any other lots. Or even if it's just residents of that town. I really hope that I'm wrong, though, because it would be more immersive for the gameplay aspect and I love building so it would be really fun to build/modify schools in all the worlds!