I’d personally like to see more underwater content and stuff to do with it, even living underwater in the right conditions. Currently water is just a deathtrap and mutations for it are the butt of jokes.
Jungles merged with cities is actually a really cool fucking idea. I can imagine half-ruined buildings covered in plants, giant trees growing through walls, cracked floors covered in greenery, Cougars and Bears roaming the streets etc.
It would really give the game that post-apocalyptic feeling and make survival more nature-oriented rather than looting private houses and living inside a regular apartment.
I love it. Hope someone can make a mod converting some/all cities into junglified messes, kind of like in The Last of Us; I’d gladly play it.