Soon we are going large update soon and it will affect many things. The islands are going away and being replaced with various shaped continents. Surface caves will be making a come back and claimed. We will also see cave being revamped and ending in less dead ends. And for those that like combat, NPCs will now only patrol the underground with varying levels of difficulties.
To read more on it, check out the post here.
Oh and the picture above, is the of the new underwater biome., enjoy!