Originally posted by Nefrarya:

Here's the answer from the pinned FAQ post:

"Will new content be added to my world I currently are playing on?

New content such as tar pits, mountain caves and Mistlands in the future will not appear in areas that have been already generated. Areas are generated 300-500 meters from a player's location. "Exploremap" and "resetmap" has no effect."

Wait: does this mean that if I used the console cheat in order to uncovers the map it does have no effect on the world generation?
So in other words, in case I would visit an area that I've never been before but was already uncovered via map-cheat could still contain tar pits?
Even if it was befor the update tart pit were added to the game?