Is the Void the enemy of the Star Guardians?

Looking at the monsters in the Star Guardian teaser on Facebook, they look like Voidborns. In particular, the giant monster looks like Cho'Gath, and there are other small monsters below that look like either giant Voidlings or Kha'Zix.

Also, we have seen the Star Guardians fighting a monster that looks like Baron Na'Shor on a previous teaser, a long time ago.