Another Korean PC MMO is making the translation to English, for release in North America over the next year. In Korea and China it is fairly popular; it is considered to be in the top ten of popular online games in South Korea.
This one is called S.U.N., and it has a hack'n'slash feel to this action-filled MMORPG.
Character classes include: Dragon Knights, Berserkers, Valykries, Elementalists, and Shadows. (Refreshing to see they didn't go with the standard Mage, Rogue, Ranger thing.) Players can create their own custom battle map adventures, where they challenge other players or standard mobs to fights.
A trailer to promote the North American release came out of E3 the other day. Judging from the trailer, the game looks like it has a quick, action pace to it.
No exact release date has been pegged, but a late 2009 release seems likely.