They just made some huge changes to leveling and how the world scales, which if you have boxed this game in the past you know the overworld was a complete joke for boxers and dungeons were the challenge. Now you can scale the challenge up to crazy difficult levels even for groups to complete. Leveling and simply taking a 6 box group through the campaign just feels great and challenging.

watch this for the best insight to the changes
https://www.youtube.com/watch?v=o4HuOi01x-Y

if you're bored, try it out.