I hope it's a big image of a treasure chest that we have to click on. I have my kiddo opening my reward cards, and he sure would be excited to open treasures. Not sure how I'm going to explain potions and DEC to him as the prize. Right now he loves to hover over the cards looking for the "gold aura - shaky shaky" card. Purple is next best thing. :)
I get my six year old son to open my cards every time if he's nearby. He loves it. Knows most of the names of the cards. Gets excited when there's a gold foil. I'm hoping these loot boxes are just as fun to open. The current experience opening packs and orbs is encouraging. They did a great job on that.