Ho mah gurdness, LO now has a website at http://game.daum.net/lime
I'll post info as it slowly loads due to Daum not liking my computer.
As far as classes go, there's going to be 3 class changes beyond first picking your class, with the split being at 15.
Mage- 15: Chooses between Sorcerer and Shaman, 30: Sorcerer becomes Elemental Mage, while Shaman becomes Soul Breaker, 45: EM becomes Arch Mage, while Shaman becomes Nightmare, 60: AM becomes Mage Master, while Nightmare becomes Warlock
Cleric- 15: Helper or Medic, 30: Helper-->Acolyte or Medic--->Cleric, 45: Acolyte--->Priest or Cleric--->Savior, 60: Priest---> Holy Spirit or Savior--->Messiah
Thief- 15: Ranger or Ninja, 30: Ranger--->Rogue or Ninja---> Assassin, 45: Rogue--->Avenger or Assassin---> Bloody Assassin, 60: Avenger--->Shadow Walker or BA---> Grim Reaper
Warrior- 15: Swordman or Guard, 30: Swordman--->Gladiator or Guard--->Guardian, 45: Gladiator--->Barbarian or Guardian---> Royal Guard, 60: Barbarian--->Berserker or Royal Guard--->Holy Guard
Also note, only humans can be all four classes now. Turgas can't be mages, and Pams/Muris can't be warriors.
As for Life Classes, there's going to be 3 specializations, with the split now occurring at 25 instead of 30. (Keep in mind these ones are Google translate translations, since Daum didn't care to put them in English unlike the battle classes.)
Blacksmith- 25: Weapon Expert or Armor Expert, 40: Weapon Expert--->Weapon Master or Armor Expert--->Armor Master, 55: Weapon Master---> Weapon Artisan or Armor Expert--->Armor Artisan
Tailor- 25: Leather Specialist or Cloth Specialist, 40: Leather Specialist--->Tanning Master or Cloth Specialist--->Sewing Master, 55: Tanning Master---> Leather Artisan or Sewing Master--->Textile Artisan
Chef- 25: Culinary Professional or Tea/Potion (just going with this,since google told me the translation was "Data mixed") Professional, 40: Culinary Professional--->Cooking Master or Tea/Potion Professional--->Tea/Potion Master, 55: Cooking Master---> Culinary Expert or Tea/Potion Professional--->Alchemist