Screencaps of Hayley Atwell, Dominic Cooper and Richard Armitage from various Captain America videos which have been released recently (click the thumbnails for full size):
Behind the shield featurette by Norton
Featurette by Dunkin' Donuts
Trailer 2 (Yahoo Movies)
And new stills featuring Hayley Atwell, Dominic Cooper and Toby Jones can be viewed at I Am Rogue and Coming Soon.