They made such a big deal of the Novas city and how they might meet them again, even though the city is gone, as they spread all over the galaxy,
Very next episode the writers make it so they completely skip 1/3rd of the galaxy and plan to go through the MASSIVE void to the next one.
How could the Novas species be met again after they skip the galaxy?
Seems the writers just decided to drop the story out of nowhere
The only possible ways I could think we'd meet them again is they have Hyperspace technology, but when the ship was launched from Novas to another planet it was going to take 300 something years to get there only being launched rougly 30 years ago.
So I doubt any of them expanded to the next Galaxy.