Since Crown of the Heavens is a set based on Hyjal, there are bound to be a ton of familiar friendly (and not-so-friendly) faces showing up. What does that mean, you ask? It means awesome artwork done by Cryptozoic's amazing art team of some of your favorite characters.
First, you should see some of the awesome new demon and satyr cards coming with Crown of the Heavens. Cryptozoic had a really cool writeup about the new monster heroes coming in the new set, including a Daughter of Cenarius named Arisella and Iso'rath, servant of the Old Gods. How cool is that? You can play with Iso'rath as your monster hero.