They may add a third. Each class has two options. Hunters class elements are either, solar (think that was what it was called) fpr gunslinger. Bladedancer boosts the arc light element as well for the second. The possibility for the third would be void based sub-class. Both the solar and arc are more damage based, which leads a lot to think that if a third void class is released (from launch or expansion) it may be the hunters "support" class. The titan has arc based for striker, and void based for defender. Their third would be solar. Again same dealio with warlock, sunsinger is their solar, and void obviously is their second. With the final (again if this is the option they plan to go with) being arc based. I understand them saying you have 6 classes to master (their dodgy answer to the question of a third sub-class for the guardians) because if you take the time to master each of the six thats a crap load of time. Then as part of an expansion they offer the new three would just bolster more fresh game play.