I'm not familiar with the Winter Soldier storyline, other than knowing who he is. He comes off a bit too emo-looking for my tastes, but I'll see how he fares in the film.
Something I'm getting from the trailer that I like is the vibe that Evans's Cap is stepping up into his role as the patriarch superhero of the MCU. He was written into that role in The Avengers
, but it seemed like he hadn't really earned it onscreen yet. I'm feeling more gravitas here in his follow-up solo outing.