Developed by Taiwanese studio, X-Legend Entertainment, Dragon Slayer will be entering the Closed Beta phase in Taiwan on 18th August. If you did not know, X-Legend Entertainment is famous in the English market for several games, including Grand Fantasia, Eden Eternal and Aura Kingdom.
While it is unknown if Aeria Games will be publishing the game, it is known that talks are ongoing for overseas servers for Dragon Slayer. Players of the previous games will find the game mechanics in Dragon Slayer familiar, and you can find out more in Part 1 and Part 2 of my brief walkthrough.