It's kind of sad that a game like this doesn't have an expected "expansion." However, we were told additional content would be added later. It would be nice to be informed pretty much immediately after it happens. I noticed the patch went in on my system but the PS4 never told me an update was needed, so I guess it just happened in the background?
Anyhow....seeing as how there is SO much space to explore in these open-world areas with trees, rocks, a few lakes and streams and almost nothing under the surface in most areas---it would really be great to see other places to visit. Although the Hissing Wastes was quoted as an "empty space" by an NPC in the game, there's a lot of places in the game overall that feel devoid of any in-depth exploration. It would be nice to see more of that.