The 3 battle packs that have already been announced are:

The Skavenblight threat

The Path of the Zealot

and, Tooth and Claw.

Watch the first of the new video tutorials and notice a new battle pack not previously seen...

Arcane Fire.

*weep* I don't even have the game yet, why do they taunt me so?

Because Nate and Eric delight in your pain. They exist on a diet of tears of their fallen foe.