Enevhar Aldarion
Hero
Ultimately I figure this new Captain America will wind up being either a turncoat or a redshirt. Hard to say which at this point.
My guess is he's Hydra
In the comics, John Walker, AKA US Agent, turns out to be corrupt and too violent and he and Sam/Falcon have a lot of conflict between them. Whether they follow that path in the show or not, who knows, but the expression on his face when he is introduced at the press conference already makes me want to tag him as an ass, good guy or not.