Today's update tells us of the enemies in the Subspace Emissary, the Subspace Army. They are lead by the Ancient Minister and the army's primary offense strength are the creatures called Primids, which come in different variations. Their goal is to carry the world into Subspace. They use Subspace Bombs, which are operated by R.O.B.s, that explode and carry that part of the world into Subspace. The update also includes a 47 second video that shows what I just discussed and ends with a giant Piranha Plant from the Mario games about to attack Kirby.
Source (More Pictures here