Pretty early to be expecting third subclasses in destiny.
Id much rather they actually expanded on the game beyond that.
But I hold no hopes for it aside from stuff you have to pay for.
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Expanded game and story are my priority too. The third subclasses will not mean much if we are stuck doing the same few things over and over again, after all. Though, like you, I am fearful that little or nothing will be added outside of paid DLC.