Am I the only one really tired of getting tribal in every f*cking set? It tends to draft and play out pretty boring most of the time, yet people seems to love it and Maro and friends put it in every single set. Zendikar 3 had 4 tribal themes (or even 5, but party was at least innovative). Even sets like Eldraine, which were supposed to be about something else get 2 tribal themes. These numbers are not too far from "tribal sets" like Onslaught (5) or Ixalan (4).
I found this. Probably a nice indicator, what we will see. And since Gavin is asking explicitly about commons and uncommons, we will probably get 100+ cards, which makes me very happy.
https://mobile.twitter.com/gavinverhey/status/1186711267823636481