The cards that have been shown so far:
Between Raiding Camps and Mounted Marauders, it looks like Chaos is hardly lacking in support destruction anymore, not that either is as effective as a simple Pillage or Demolition!. But Chaos already has the potential to shut their opponent down with a first turn Sorcerer of Tzeentch, and with these guys in the deck too, the danger of the game being almost decided right from the start only increases. They also make starting with Heroic Task more risky.