I found this reddit thread recently after wondering what was happening with the third empty sub-class slot in the Character menu.
The gist of it is that there are three "Elements" - Solar, Void, and Arc. Each class has a combination of 2/3:
- Titan: Arc/Void
- Hunter: Solar/Arc
- Warlock: Void/Solar
The idea behind this is so that you will be inclined to use at least two of the three classes, to gain access to all the elements. However, there is also a third, empty sub-class slot; leading me to believe something's coming...
The link I provided above suggests this will be a mix 'n' match style subclass, where you can select abilities from either sub-class to create your own custom one.
Does anyone know what this third slot is actually for?