From their announcement:
Behold the awakening of the Tree Warriors, the powerful beings who arise to crush all who dare oppose the forest elves... To help you complete and renew your army, we've just dropped by nearly 20% the price of a box of 3 different Tree Warriors. But there's more : for a limited time only, get 4 boxes for the price of 3! That's 12 Tree Warriors for the price of 9!
And each of those 12 Tree Warriors can be unique, because all parts are compatible and interchangeable with a ball-joint assembly system for an infinite number of variations and poses!