The Tree of Savior team has posted a detailed developer blog to show players the Rank 8 Update that will be deployed in September. With the arrival of Rank 8, twenty-four new classes will be added, each completely unique with its own "concepts". In addition, the level cap will increase to 330.
The official site blog goes into detail about how each of the four base classes (Swordsman, Cleric, Archer and Wizard) will change with the update.
Lastly, thirty new maps will be added, each with a unique bestiary and artistic composition.
Check out the full post on the Tree of Savior site.