I just looked it up on the site that I got my other information from, other than singing their respective songs (which they all do) Egypt doesn't have anything special.
China - Automatically knows the songs local to China, autonomously pulls out a Chinese fan and fans themselves between actions, eats all food with chopsticks. I'm unsure, but greeting sims with bowing may also be included.
France - Automatically knows the songs local to France, greets sims with kisses to both cheeks. I'm thinking there's something more to this one, but I don't know.
Egypt - Automatically knows the songs local to Egypt, autonomously pulls out a water-flask and drinks from it between actions. I think there's more to this one, too, but I have little experience with these hidden traits (or more like, all hidden traits), and I only know this from other players' information.