It could also be titles. We don't know because the it such a vague comment. lol

What we do know:

Yoshida-san is between two possible plans at this time. The first idea is that the traditional names would be introduced as “higher” or “advanced” classes. The traditional classes would thus be something of a goal for players. The second idea is that the traditional names would be more of a subset or specialization within the existing classes.
Unless they found an alternate route.