the plot will be more than just "defeat bad guy" everyone will actually have a reason to be in the game, etc
reku is actually a country now not just an unknown entity (i didn't even know whether it was a fictional world, nation, or region until recently)
a map of the entire skyward world and national borders will be released soon. a lot of these nations will hold relevance in skyward 4. i will go more in depth on their governments, leaders, people etc. in a later leak. matthew and the gang will actually travel in some of these places and meet new allies/enemies there.
obviously as i've morphed from that one guy who spends all his time on sploder to a person that actually gives a crap about the world, there will be more cultural influence in skyward. 4 each world will be based off of a real-life country and they will be much more in-depth than skyward 4's levels.
planned worlds already include one based off of japan, one based off of central africa, and serbia. as for matthew's hometown (Bului) it's more or less a combination of my hometown and nassau while reku city is based on chicago, new york city, and seoul.