How is the free roam in this game?

[Gimli]

Are there any free roam activities to do post-game? Are there random encounters? Do bandits, zombies and loot respawn, or is the world pretty empty once you've completed everything?

[Winter]

I don't know, but I'm bumping this because this is a good question.

[Hellbishop]

Everything respawns in the game world and there are random encounters like saving survivors in different situations as you travel around. Plenty of unending free roam to enjoy just like in the first DYING LIGHT game.

[Matty101]

The random encounters are very small though, one of them is just walking up to a guy and pressing a button to give him medicine, saving a guy by killing 1 regular zombie, releasing a guy that's hanging,killing a single bolter zombie/looter.
Probably the biggest ones are the big elite zombies and the group of bandits that appear as orange markers when the game is completed but its kinda more of the same they just take more hits.

You can always do the timed challenges to keep getting better scores, some easter eggs to find and other than that not a lot.
Just like farcry and the newer ghost recon games i guess once you clear the map there's usually not enough for most people to keep playing.

[Zednaught]

Here's the thing about post-game: the entire world is covered by a thick brown fog. It really muddies things, and it's made me not want to play the game any more. Really poor decision on the developer's part.