I love this game too, but Mistlands update when it drops is obviously going to be the first of its kind, a whole new biome to explore. Not only that, but they seem to be expanding on other aspects of the game also like ships, fishing, & new building pieces & new weapons as it seems from images & videos I have seen.

No other content patch or update has included an entire new biome before thus far. If I had to hazard a guess I would say the biome itself is the time sink that is taking the longest part, not that it is a bad thing, I don't mind the wait, I have plenty of things to do in the meantime.