The Lineage II Revolution website had just been updated with a new date (counter) on it’s Homepage which says June 14. I’m assuming that is the launch date for the English version of the game.
Lineage 2 Revolution is a sequel to the PC game which takes place 100 years after the events of Lineage 2. The game is made with Unreal Engine 4.
Currently, I know that the game’s pre-registration is not open to all countries. However, the milestone event has been achieved so no issues there! If the game actually launches on the 14th, you can always download the APK file or create a foreign iTunes account.