Crimson Dynamo, Abomination, Baron Zemo, and I'm fairly certain that the purple figure is X-Ray of the U-Foes. He's already appeared, and that's his true form in the comics.
On the DC Animation Forum, I'm making a character count thread starting on the premiere. I think I'll do that here too for this series.
EDIT: In retrospect, that might be Wonder Man. Well, it's one of them, that's for sure.
"A lonely wretch named Jervis Tetch."
"In Wonderland, the Mad Hatter reigns supreme!" - Mad as a Hatter
Thor on May 6th, 2011!
Green Lantern on June 17th, 2011!
Captain America: The First Avenger on July 22nd, 2010!