From the introduction:
This supplement includes content for every race.
New terran specializations, advanced Specialization, and talents for new character builds, such as the UED Medic, the Hellbringer, the Highwayman, and the Assault Trooper. Also featuring new weapons, upgrades, and premade vehicles and NPCs related to these builds.
Introducing protoss Renown classes, allowing protoss characters to further specialize in their chosen forms of combat. Renown classes are for mid-high level protoss characters. The Renown classes that are covered are the Avenger, Blade Dancer, Master Phase Smith, and Signifier. Example characters with these classes is included in the game as NPCs to introduce in your games.
Ten new zerg strains to battle in your campaigns, including favorites from the Left 2 Die and Dead of Night missions in StarCraft.