I think they will finish completing the European continent with Denmark and Poland (in addition to adding more maps and real houses).
After that, more expansions will come from other places in the world such as Oceania, the Pacific, and they will return to expand even more to America and Asia at some point. These last 2 are very underrepresented.
Part of Africa and Madagascar would also be missing.
That’s what I believe, but what I would like is for them to finish completing the African continent.