Nintendo has revealed some new job listings on their official website and they suggest that The Legend of Zelda: Breath of the Wild 2 will feature some form of dungeons.
According to the job listings found on the Nintendo of Japan website, Nintendo are in search for new 3D computer graphics designer that will be tasked with the games terrain. The other tasks include fields and dungeons. A second listing says that Nintendo are after a level designer to "work on the planning and implementation of dungeons in addition to events in-game".
If Breath of the Wild 2 has more of a concentration of dungeons we could see massive expansion of the game below the surface. At the moment we don't know when Breath of the Wild 2 will be released, but if its going to be anything like the first game we will be in for a wild ride of delving into a meticulously developed world.