It's hard to say as they haven't said anything. They could do what Elsword did and allow for Korean voice overs with English subtitles. That would be the quickest way to localize without having to hire new voice actors. I'm not sure how many people would like this though since not everyone likes to read subtitles.
Korean voice overs are really good, tbh.
Please excuse the bad Engrish. I'm still learning !