very beautiful expansion!
Wurmbone's End is especially beautiful. The Dreadcutter is cool too - who doesn't want to fight on a Pirate ship? (and you can even get it as a personal home)
There's also several new mercs in the game that you can win from chests, and I suspect you will soon be able to "own" more than one merc at a time.
If you count all the instances together from this expansion, you'll get about 20! AMAZING!
Your Characters "alternate advancements" (customization) got a big revamp also. You gain really funny prestige abilities that can up your DPS remarkably if you know how to use them, and you get seperate Tradeskills, like a harvesting goblin who can even find rares, experiment on your crafted gear to make it more powerful, etc...