Wizard's Tower looks very cool, and should probably be an auto include (although not necessarily an auto play) for every Wizard. Using cheap attack spells will generally be the order of the day, but you can switch into burst damage if appropriate, plus it acts as fantastic swarm suppression.
The new Beastmaster looks interesting. She'll have a better reason to use the Lair than the original BM, and I can see playing Lair in FC on the first turn being a way to really pressure your opponent quickly. The lack of Quick Summoning will make it harder for her to swarm, but Wounded Prey is great innate swarm support. It's basically a free Marked for Death for your animals. The new bow will synergize nicely with her animal options.
The new Priest looks like a much better fit for my play style than the Priestess. Holy Avenger is worse than Pet, but still a valuable ability. Malakai's Fire sounds amazing. I'll need to think a bit harder about how to manage mana efficiently with him, since he has more things to spend mana on and lower channeling, but I'm looking forward to playing him.