it was supposed to be out at the end of october, but they decided to change some code and ended up rewriting a whole lot
The need more time
it won't affect you much,
Think of it like this, you are sheep(the main dev) and the code is wiring to your computer(this game): if your wires(code) is all tangled up, it will be harder to add new components(stuff and mechanics) to your computer(this game), and you will most likely need to spend some time untangling it all