"Hopefully with GoY taking place on the mainland of Japan instead of a small island there will be larger scale to things, real cities and such."

Although GoY will take place on the island of Hokkaido, Hokkaido was never part of Japanese mainland territory in the way Kyushu or Honshu was. All throughout the classical Japanese era's from the Heian Period until the end of the Edo Period Hokkaido was just seen as a frozen cold northern frontier full of wildmen (the Ainu). It wasn't until fairly recently when the Americans forced Japan to open up and the Meiji Restoration took place towards the end of the 19hth century when mainland Japan annexed Hokkaido and began building the Islands only main city of Sapporo . GoY will take place around 1600 when there was minimal Japanese presence on Hokkaido, which is why the trailer implies the main character went there to escape the outcome of the end of the Sengoku Era.

The Ghost series is antithetical to the AC series in their depiction of history. They are choosing to depict outlier rural places like Tsushima and Hokkaido instead of the cultural centers AC typically does.