Don´t know if it's asked yet, but is it possible to stay on my old world on xbox one with the new update? Or do I have to create a new world to have those new things from the update?
If it works like PC version, any chunks that haven't been visited yet will have the possibility of containing new Biomes / Bricks / etc. All the places you've been before will remain the same. New mobs / mechanics should apply everywhere.