http://www.comingsoon.net/films.php?id=44655

Iron Man 2

Release Date: May 7, 2010
Studio: Paramount Pictures, Marvel Studios
Director: Jon Favreau
Screenwriter: Justin Theroux
Starring: Robert Downey Jr., Gwyneth Paltrow, Don Cheadle, Jon Favreau, Mickey Rourke, Sam Rockwell
Genre: Action, Adventure

http://movies.ign.com/articles/942/942623p1.html

January 7, 2009 - Mickey Rourke, the so-hot-right-now comeback star of The Wrestler, and Sam Rockwell (Confessions of a Dangerous Mind) are in talks to join the upcoming Iron Man sequel as dual villains.

Rockwell, The Hollywood Reporter says, is up for the part of Justin Hammer, "a multibillionaire businessman and a rival of industrialist" of Tony Stark. Incidentally, Rockwell was one of director Jon Favreau's original choices for the Iron Man role.

As for Rourke's part, there appears to be some confusion. Variety says that he would play "Tony Stark's Russian alter ego, a heavily tattooed bruiser who is in the arms trade and battles Iron Man in his own nuclear-powered armored suit." The trade mag hints that he's the Crimson Dynamo.

But wait... The Hollywood Reporter describes the character differently. They say Rourke will portray "a tattooed Russian heavy named Ivan who becomes Whiplash, a man with deadly, technologically enhanced coils." That doesn't sound like Whiplash at all -- that character is a girl, except in the Ultimate universe where he's only been briefly glimpsed. The description sounds a little bit like Omega Red, but we're inclined to think that Rourke is actually playing Crimson Dynamo, as Variety states.
http://en.wikipedia.org/wiki/Crimson_Dynamo

The Crimson Dynamo ("Krasnoe Dinamo") is the name of several fictional characters in the Marvel Comics universe, most of whom have been supervillains. The various Crimson Dynamos have been powered armor-wearing Russian or Soviet agents who have clashed with Iron Man over the course of his heroic career.