Actually I know how they are going to do this. This month we got the selection box mini 4. Next month on august will have the 41st mini box. Then on September will release Vrains world with the new main box 42 with character’s ace monsters in it. Konami did this last year. Usually we get new worlds and new summoning every September. So don’t worry we will get the mini box this august. Be patient.
I think the next mini box might not have any cards related to what rio uses since her ace monster is already in her level up reward as well as the others in the event. Hopefully Soul Eating Oviraptor and Utimate Conductor Tyranno will be in the next mini box. If not idk.