Sheesh people, it's not like development will stop after this DLC is released. We'll see what he has in store after it's released, there's no point in crying about it. Besides, as far as I'm aware people have been talking about how much missed opportunities there are in this game for quite a while, so we've all heard it already. At the end of the day though he's still working on the game so we won't know what he is going to release next. And if it turns out he's done with the game after this DLC, well...
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