The powers that be have definitely made changes to what spawns where and how often they spawn. As recent as the start of this year, I was hard pressed to find enough deer meat to feed the plethora of wolf packs surrounding my HQ. I believe just prior to the Frost Caves instalment, is when the change occurred and I no longer have to hunt outside the environs of the main base to find enough deer meat to sustain the many wolf packs. Boar & deer now spawn so prolifically that the wolf packs supply themselves, and are even increasing in size and range. Boar, deer and necks, are also spawning in locations in which they historically had zero presence.

Historically I have never known of a troll inside a cave respawning after it is killed, but those outside of caves will respawn in the same location some time after being killed. I know this for a fact, as there was and is 3 locations where they respawn beside copper nodes I have marked on my map, near one of my main outposts. I use these respawning trolls to break up and mine the copper.