To be honest, I hope they don't add a huge desert zone, or have a Desert Based expansion.
I'm really getting tired of Deserts in video games. Just about every Video game released now has a major desert area or is based completely in the desert. Including all the war games.
I've been tired of Deserts since Dust in CS.
I want an expansion that lets you explore a Overgrown Forest eating up ruins that are still inhabited by people.