They are Black Panther, Black Widow, Monster Hunter, Sigma, Venom, and Winter Soldier.
"Winter Soldier excels at ground combat using special moves that send the opponent flying across the screen and projectiles that bounce off the walls and floor".
Over on the Capcom Unity Website is a pretty thorough breakdown of each of the new characters.
Capcom has announced that next month will see more characters coming to Marvel vs. Capcom: Infinite, with Avengers agents Winter Soldier and Black Widow joining Spider-Man's symbiote nemesis, Venom.
The trio come hit the crossover fighting game on 5th December, Capcom said. "Bucky can activate Metal Shield, which utilises his cybernetic arm to turn him into an anchor, allowing him to ignore attacks without taking any damage".
Unlocking any of these characters, either individually or with the character pass, will also unlock their respective premium costume. The trade-off is that Winter Soldier's move set is severely limited while the Metal Shield ability is active.
This isn't the first DLC character pack released for Marvel vs. Capcom: Infinite. His new movement option is Venom Glide, a web zip of sorts, which can be aimed in six different directions, enabling him to keep the pressure going in his favor.
Marvel vs. Capcom Infinite is available now for the PC, PS4 and Xbox One. Likely, he's being used to boost the chances of players buying the deluxe versions of the game that include the DLC characters. This promotion will end on November 27, the day the demo ends.