The way I see it, Rogue and Ninja will be the same as the other classes. New players can start as a Rogue and unlock Ninja at level 30 and non new players can become Rogue by going to their guild. I would not make sense for them to unlock Rogue for everyone, but keep Ninja untill the 2.2 content. The Rogue players will have worse stats and will be missing certain skills from 30+. I keep seeing people say that Yuguri is going to be the Ninja guildmaster (has this been confirmed?), I havent finished the Levi-chan questline, so I dont know how its going to end.

Only way I can see Rogue and Ninja work is to either let players unlock them at (Rogue) level 1 or 10, (Ninja) level 30. The other way is putting both class and job behind the 2.2 content.