Here is the first notice of the major update coming to Pokemon Duel. A screenshot of upcoming update was revealed with no explanation. But no words were needed. Take a look for yourself..
It appears a new hall is coming to Pokemon Duel where you can enter new leagues with specific criteria (like using only UC or lower figures). In the screenshot we can see three halls, All Unique, UC or Lower, and 2-2 Start. Prizes are also rewarded in this league.
The next major note about the update is coming July 26!