Lost Ark is a Hack and Slash action MMORPG that being developed by Smilegate & Tripodstudio. Theres no info when game going be out but probably soon since developers released gameplay video. Game looks like Diablo and Lineage Eternal (upcoming Korean game).
Hack and slash online games becoming more popular lately so we can except more similar games soon. Right now smilegate announced 4 game classes (Fighter, Warrior, Magician, Gunner) and there going be 18 playable characters in release.
First Closed Bets Test going start next year and English version going be released right after Korean version if developers find West publisher.