From the release:
The time has come to infuse your SSU army with a heavy dose of heroism. The SSU Hero Pack Expansion for Dust Tactics and Dust Warfare is now available at retailers everywhere and online through our webstore!
The SSU Hero Pack introduces three exceptional heroes to lead the forces of the SSU into battle. Yakov Pavlov is well known for his leadership on the battlefield, SMERSH agent Red Yana is an extraordinary fighter, and Nikolaï is a distinguished tank commander and crack shot.