Cooper played Howard, Tony Stark's father, in Captain America: The First Avenger, and again in a cameo appearance in the Agent Carter One-Shot.
The announcement isn't a huge surprise. Descriptions of the series have made clear that Howard Stark would be involved, and though this is the first official confirmation of Cooper's involvement, there was never any reason to believe he wouldn't return to the role.
Marvel's Agent Carter, starring Captain America's Hayley Atwell, follows the story of Peggy Carter. It's 1946, and peace has dealt Peggy Carter a serious blow as she finds herself marginalized when the men return home from fighting abroad. Working for the covert SSR (Strategic Scientific Reserve), Peggy must balance doing administrative work and going on secret missions for Howard Stark all while trying to navigate life as a single woman in America, in the wake of losing the love of her life--Steve Rogers. Inspired by the feature films Captain America: The First Avenger and Captain America: The Winter Soldier, along with the short Marvel One-Shot: Agent Carter.
Agent Carter will premiere in early 2015.