2p.com has an interesting article about three new classes and other changes coming to Lost Ark in the second round of closed beta testing in Korea. The three classes coming with CBT 2 are Destroyer, Arcana and Summoner. These three come along with big improvements to character animations, monster death animations and balance tweaks to existing classes to make them feel more unique. Lastly, the quest system has been overhauled with some being removed and other modified to fit better.
You can check out the full Lost Ark report at the link above.