Today's update sheds some new light on the game's adventure mode.
Though we know a bit about Super Smash Bros. Adventure Mode, The Subspace Emissary, it's still unclear exactly who the antagonists are, and what their motives might be. Today's update gives us a couple of answers, though.
The Subspace Army (the strange, rag-doll looking creatures from an earlier update) is led by the the Ancient Minister who, with the aid of Robot Operating Buddy units (yes, the same R.O.B.s that were bundled with the NES and appeared in Mario Kart DS), is setting off bombs in the world that transform the engulfed area into subspace. This achieves a goal that is currently unknown.
In an accompanying trailer, Mario is shown to try to stop the bomb from going off. Unfortunately, a sphere knocks him out of the arena before he's able to reach it. Kirby looks around to survey the scene, but all he finds are Princess Peach and Zelda, previously there to help, captured in cages by a Piranha Plant. Left alone, the update is closed with Sakurai noting, "This is a new, never-before-seen form of aggression...but now is no time to stop and stare. Everyone, everywhere, is beginning to move against it."