Broken Realms: Morathi is more than just a story-continuation of the world of Age of Sigmar. It's updating a lot of rules, too, particularly for some specific factions and miniatures. In this preview, we get a look at some of those updates. Have yourself a look.
From the article:
Morathi is making some power moves in the opening stages of the Broken Realms saga. Her actions aren’t just written into the background, though – they have a massive impact on the way she plays in your games. Today, we’ll give you an early look at a few of the updates, as well as some juicy tidbits for the Idoneth Deepkin.
We’ve already hinted at the biggest change to Morathi – namely that players will be able to field both of her forms at one time. If you’d rather wait to learn more about that in the book’s narrative, read no further.