From experience in the Japanese version i can bet most people will go 2hander + some minor healing spells. This is all i seen online playing WKC.
Every class has STR, AGI, INT, DEX etc bonuses. So everbody will grab the stat increases from each class while focusing on either raw damage or magicial damage with minor healing. I never experienced a dedicated healer as its not required online.
If i decided to pick up the international version i think ill go archer with support magic just to make the game more challenging for me.