Originally posted by Qubo Night Owl:

Do you need to start a new world for it to have the various things they have added to the game since the initial early access release.

if there is an unexplored area on the map, then new islands will regenerate in a new way (with new things/mobs/dungeons). I play solo on the map, the plains were scouted, then there is life on them, but I met new things on new islands, also mistlands lands (the scouted island has a "broken" appearance), but after scouting the new island after the update, everything is ok(at new).