Kobolds and Catacombs is live and I can't seem to get enough of it. The new mode, Dungeon Run, is even more fun than I had expected.
It has a ton of possible bosses, each with their own abilities and tactics. You start by picking a class and receive a 12-card deck. When you defeat a boss you get to add more cards to your deck to use in future encounters. As your deck gets better, so do the bosses.
You need to defeat 7 of the many normal bosses and one of the 5 final bosses in order to complete a Dungeon Run. If you complete it with all classes, you get a card back as a reward.
You will also get 3 Kobolds and Catacombs packs for free if you log in and 3 more if you complete 3 dungeon-related quests.
Are you in?
If you are, here are some tips for the Dungeon Run:
Lastly, have fun. Stay awhile and listen.. to the bosses' comments; some of them are truly hilarious.
Edit: I forgot to mention that when you log in you also randomly get one of the new legendary weapons. Good luck!