Friend joined the series as Quinn in season 2, and has since been a major ally to Carrie.
The upcoming season will see Carrie return to the states, where she will take up residence in New York.
Homeland stars Claire Danes as Carrie Mathison, a former CIA intelligence officer who now works in the private sector and struggles with bipolar disorder.
The trailer does give us our first look at Elizabeth Marvel as Elizabeth Keane, the recent President-elect.