I'm so excited as well! I think it was a smart move for them to open up World Adventures first, because they are expanding their world within the Sims 3 first. I know some of us feel ripped off because it seems like a repackaged Vacations, but this one seems to hold more than Vacations. Egypt? Seriously!? That's freaking AWESOME. I learned about Egypt mainly from Ancient Civ's class a few years ago, and it was one of the most intriguing places I've read about. Also, in every great action book/movie, there's always some link to Egypt somewhere along the line because of their interesting history! Pyramids of Giza, sphinxes... Let's just say I'm so stoked.
China... WOW... That is so cool too. I mean, I wish they could include EVERYWHERE, but that would take a really long time. I'm satisfied with France, Egypt, and China (Yay panda's!).
I seriously can't wait to see this in the Sims 3 with the new seamless environment. This is going to be AWESOME!
And overtime, once we get the town building tool, I'm sure people will be able to build countries like the ones we are getting with WA, so just be patient.