With the Closed Beta fast approaching (November 4-11), Amazon Games has (finally) posted details (in a short patch note format).
https://www.playlostark.com/en-us/news/articles/closed-beta-details
Additionally, the company posted a more detailed overview regarding the business model they will be pursuing, including an explanation of the various in-game currency (same as the Korean version but with adjustments to the in-game store that falls more in-line with what western players expect).
The game is still slated to launch in early 2022.