Ehh, I could see it as going either way. Personally I don't think he will introduce other worlds this early in the series... I think that will be more for the Sci-Fi side of things. My personal theory is that when Harmony was remaking the world, somehow the remaining obligators who had originally fled to the Conventical of Seran after the lord rulers death either had a quasi storage cavern or another compound that they went to, which ultimately ended up on the southern continent.