I was curious about all of this downgrade talk. I watched the 2013 E3 trailer. Anyone that saw that video and thought it was in any way realistic or representative of actual gameplay wasn't paying attention to it.
Anyway, they should have some roadmap for expansions so they make sense. Overworld, underworld, deep dank underworld I guess. Then a forest level. Maybe there's a DLC trip to Appalachia. That'd be sweet.