Maplestory "High Five" Private Showcase

I don't think they made any new job titles in this patch. That's a big dissappointment.

Correct. There won't be new class names from this new advancement. Nexon didn't go with the traditional way of implementing advancements like they did with the 2nd, 3rd and 4th job advancement.
Why not? I don't know. Maybe it didn't work that way because of the amount of classes the game has? So many new skills can make balancing a very difficult job. Now, with the 5th job advancement every class has one new skill.
Tidbits of info about the 5th job advancement were revealed in 2013 and they started to work on a prototype since then. Though the prototype was created under the supervision of the previous director. Every director has different ideas for the game. Now we have Wonky the Fairy as the new director who is responsible for the new content and especially for this update.

The advancement is an upgrade of the obsolete Hyper Skills system. I have mixed feelings about it.
Personally I am most looking forward to the new continent of Arcane River and Lucid along with the storytelling now that I have seen what the 5th job advancement is like.