The new edition of Age of Sigmar is hitting tabletops now. But if you just grab the new rulebook, you might be missing out on some of the changes. There's also been a major FAQ update for all the factions. To help you find stuff easily, Games Workshop has posted them up in one spot for you to check out.
From the website:
Greetings from the Mortal Realms,
With the new edition of Warhammer Age of Sigmar arriving tomorrow, we wanted to let everyone know what they can expect from the accompanying designers’ commentaries and errata mentioned here.
Throughout the development of the new edition, we were well aware of the impact that many of the new mechanics and features would have on existing battletomes. We tried to cover as many rules as possible in the Core Book to account for these changes, but many had to be looked at on an individual basis.