Rising star Wyatt Russell has signed on to join Anthony Mackie and Sebastian Stan in Marvel's Falcon and the Winter Soldier series, it was announced today at Disney's D23 Expo. Emily Van Camp is set to return as Sharon Carter, aka Agent 13, while Captain America: Civil War star Daniel Brühl will reprise his villainous role as Baron Zemo. Sources say that Russell will be playing John Walker, who's otherwise known as U.S. Agent, who in the comics was apparently part of the group known as the West Coast Avengers. [caption id="attachment_719535" align="alignright" …