Some of the changes made to the gameplay
This was the translations i was able to get from the
C3 Preview Site.
Subclasses
Once you reach lvl 75 you can now choose a sub class of a 2nd time transfer (Lvl 40 job). You can switch between the sub and main class on a town NPC and level up the one you want. You can't however use the skills of both classes at the same time.
PvP
The major change to the PvP was the new feature called "Combat Will Points" that basicly act as a shield that regenerations. Suposed you have 1000 HP and 1000 CP and take a 500 damage hit, you would have 1000HP - 500CP, if you took a 1500 hit you would have 500HP - 0CP.
CP slowly regenerate and can be increased with a Will potion.
The CP system will bring some major changes to Clan Wars and Castle Sieges (btw great picture huh? and yeah that does happen in-game and they are all human players

)
Noobs now have an easy life untill they reach lvl 20 having lower EXP losses rate and free soulshots of no grade.
I dont have a translation to this one. If anyone here is korean and can help me out i would apreciate it
