Creative Assembly has provided the first information on additional packages for Total War: Warhammer.
Content DLC will be bundled in free and paid, and the latter is ranked in the Lord Pack (2 Legendary Lords, new quests, two generals, a new unit), Race Pack (factions, tech trees, and content as the Lord Packs) and Campaign Pack (previous additions and Challenge Campaign).
Free DLC will include new units, abilities, and Legendary Lords. But the most consistent will bring a new faction, with all that entails, including singleplayer campaign towards the end.
Via: Tech Gizmo