Where does one find out information on upcoming DLC and/or map packs?

[mrkenn]

I was hoping to find out information on any upcoming DLC or map packs, and I haven't seen anything on them yet. I would like to get old Neb himself, since I thought the physical copy would have a physical manual. I also opted for the Walmart version, only because I wanted the map to the Americas. Now I wish I had bought the special addition on Steam......