Same as me. I don't think it was outright stated but certain promotional material such as the scenes with the show staff during the premiere has stated that places mentioned before may be potentially visited. That is, if such a thing can be considered worldbuilding.



If you've noticed too, the friendship map does bear a strong resemblance to the official map of Equestria that was released post Season 2. Given the details of both maps, I speculate the Griffon nation will be visited.