Capcom has said that they were going to show Dormammu, Firebrand, and Ghost Rider in a new trailer during next week's Gamescom, but those plans have been pushed forward.
The trailer went live today, and does as promised show the newly announced characters. Not only that, it all shows a bunch of the characters that will be playable, including how Chun-Li looks after her much requested facelift. Finally, the Japanese company has confirmed the thirty characters that will be in the game at launch. The "leaked" list wasn't exactly spot on:
From Marvel
Black Panther
Captain America
Captain Marvel
Doctor Strange
Dormammu
Gamora
Ghost Rider
Hawkeye
Hulk
Iron Man
Nova
Rocket Raccoon
Spider-Man
Thanos
Thor
From Capcom
Arthur
Chris Redfield
Chun-Li
Dante
Firebrand
Frank West
Jedah
Mega Man X
Mike Haggar
Morrigan
Nemesis
Nathan Spencer
Ryu
Strider
Zero