Palworld cards have sold 4.4 million packs

Bushiroad says its first Palworld set sold 4.4 million packs worldwide.
That set only came out July 30.
A booster box is about $46 to $54 at MSRP.
The next set, Legends Awaken, is already announced.

Case order on Legends Awaken, or does every hot new game cool off before the second set lands?