Hangame recently posted some more information about CBT2.
1. Classes
Berserker
1) It is a subclass of the Warrior base class.
2)They use a giant sword to deal a large amount of damage to their helpless enemies.
3) They use their rage to massacre large swathes of enemies, using buffs to become stronger and faster.
Assassin
1) It is a subclass of Ranger.
2) They are very fast wielding daggers, with their basic attack pushing enemies.
3) They are suited for fighting single enemies more than crowds, and take advantage of weaknesses.
Cannon Blazer
1) It is a subclass of Ranger also.
2) Instead of bows, they use cannons (obviously....).
3) They use gunpowder to increase attack (a buff?) and have an artillery bombard attack.
High Priest
1) It is a subclass of cleric.
2) They pass up the mace and shield in favor of more support.
3) They use heals and buffs to support their allies in battle and are good at controlling crowds.
Wizard
1) It is a subclass of Mage.
2) They pass up the staff in favor of the wand for more damage.
3) They fire explosive magic bullets to deal large amounts of damage.
2. Maps
1) New maps have been added.
3. Achievements
1) Achievements have been added to the game.
2) They can be accessed by Pressing (P) or using the UI.
3) Titles are added and they give stat effects.
4. Market
1) The market system has been added.
2) A 5% listing fee will be taken upon listing an item.
3) The mail system has also been implemented.
4) The friend system has also been added.
Source:
http://ds.hangame.com/xbbs/bbs/read.nhn?bbsNo=6&mBbsNo=8&artclNo=4074