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Apparently nothing needs to be changed at all, but the language from korean to english, as all people I've talked to playing on the korean server currently don't see anything that needs to be changed actually to appeal to the western countries.
The game is fun to play, has not too much grind and is quiet polished. There's lot's of quests and group-instances and it's multi-player oriented instead of a solo-grind-fest.
What kind of stuff will be done by this "westernization" EnMasse/Frogster is talking about?
I don't see them changing the artstyle, which is apparently pretty much asian style, but the rest is good as it is, even for us western players.
I actually fear, that they will screw up the game instead of making it better...