Just quoting something that I didn't know I think is quite intriguing:
Side Quests (3rd paragragh): "Which side quests are available is randomly determined by the app. The quests are drawn from the pool of side quests that players have unlocked, both through their collection of physical products and in-app content that they have purchased,"
I was under the impression that physical products wouldn't provide exclusive content, its sole purpose would instead only be to provide additional content when the app randomly generates the maps (tiles and monsters).
Also, the rule change affecting "area of effect" damage (such as Blast), which will only deal half damage on secondary targets is a good call...