it isn't overly uncommon for games to lock content in the game behind dlc paywalls and hide said content until the dlc is ready
this has been a thing for years on end, it is easier for the company to have the stuff in the game, waiting to be finished and released, rather than flat out added into the game [although this can still happen if not everything was done in advance]
also i don't ever remember stellaris for console edition being marketed as "complete" (if someone can prove me wrong with links/screenshots of a paradox dev saying other wise please feel free to respond with it)
could we viably get distant stars and megacorp in this dlc pass? yes
could we get them in a pass 3? yes
as to what will happen, that is for paradox to decide
this has been a thing for years on end, it is easier for the company to have the stuff in the game, waiting to be finished and released, rather than flat out added into the game [although this can still happen if not everything was done in advance]
also i don't ever remember stellaris for console edition being marketed as "complete" (if someone can prove me wrong with links/screenshots of a paradox dev saying other wise please feel free to respond with it)
could we viably get distant stars and megacorp in this dlc pass? yes
could we get them in a pass 3? yes
as to what will happen, that is for paradox to decide