From their website:
This summer, Death Angel players will be able to enter the infested Space Hulk Sin of Damnation in an effort to exterminate the awaiting swarms of Genestealers. It will take cooperation and effective planning to survive such a deadly mission, and today we will preview the tools necessary to get the job done.
As a quick refresher, take a look at the description page to learn how setup works in Death Angel.
Action cards are the heart of Death Angel, since they are the only way to issue commands to your combat teams. These cards come in three different types: Attack, Support, and Move + Activate. There are a total of six combat teams, each with their own distinct color. Each combat team has its own set of Action cards which can only be used to activate Space Marines in that specific combat team (matching the color of their Action cards).