Im too busy right now to rewatch the video but what makes you think that we are getting a new race? I believe those pictures are all of the city-zone, but who knows.
Super technical race wayyyyy more advanced then anyone out and the use of the word. If it was a place it would be called Estria not Estrian. Think American or Russian.
It just makes sense to me because most of the buildings called Estrian are located with file names that say Planetouched Wilds in front of them. This really makes me question just wtf PTW actually is.