Other reason why I had thought the PSO bit was granted it was from the VS mode, but they were in a room which appeared to have doors in the middle of them. Which gave the idea of potentially locked rooms till enemies / other players are cleared like with the original PSO game for example and the simple dungeon design.
Maybe. We'll have to see. What makes me wary about considering a "deeper" level of level design and mission complexity is that there aren't many signs so far that the game is meant to have a strong single player component. If it does, then that sort of feature would make a lot more sense.