There's basically a world that has five zones. Before, you had to choose "What do I choose as the two zones of low levels that I begin my expansion in?" Now we have world-scaling which lets us say that if you enter Azuna at 100 levels and it's level 100 for you.
However, when you go to Azuna at the end and your companion is level 108, you are able to form a group. The level will take him to 108 and 100 for you, and you'll both contribute to the game and each receive ... Read this article | User's blog