The next mini-box will be after one month after this box which mean it will be released around the end of August. After this mini-box by 3 weeks there should be a another main box which will be delayed for 1 week in order to be released with the new world.
U r right
Most probably a mini box will be there in mid-late August. Then a new main box in early-mid September.
Considering konami's trend of past new world releases, we will be getting a main box instead of a mini.
The possibility after this box there will be a mini-box, then the last main box before Zexal, then they skip a mini-box to release new world main box instead