People have tossed around the idea that there might also be "Job specific weapons", since the devs mentioned job specific equipment. So for instance, if say they added Dark Knight later on, instead of adding a Scythe class, they could just have Scythe weapons that can be used by Marauders as long as they have Dark Knight set as their job. The same thing could be done with say Rapiers for Red Mages as Thaumaturge.

I do hope that the class just unlocks the job to be used, not that they are locked into that class only. So you could be a Lancer/Paladin if you wanted to, but it might not necessarily be the best.