Alpha Patch 1.1.1 - Hunter Port
Alpha Patch 1.2.0 - Mage City, new Hunter and Warrior gear, new quests for Enchanted Forest
Alpha Patch 1.3.0 - Mushking dungeon, level cap increase, boss drops and unique monster drops, maybe enchantments, stronger, higher-leveled monsters
Alpha Patch 1.4.0 - new area, even more questing, crafting maybe, new class abilities
more Alpha patches in between this
Beta Patch 2.0.0 - subclasses introduced
Most of what I could come up with.