Tonight's Marvel special on ABC showed a scene and a short trailer for Agent Carter, which will start airing in January. It features the return of Dominic Cooper as Howard Stark and the introduction of James D'Arcy as Edwin Jarvis.
It looks like we know what the MacGuffin for the first episode is going to be. The end of the clip also shows Peggy in a very serious fight. She looks kickass and this show looks like a period Alias.