You may have here below a first look at Mickey Rourke as Iron Man's new nemesis, Ivan Vanko aka Whiplash:
(Click on the picture to enlarge it.)
Whiplash makes his first appearance at the Monaco Historic Grand Prix.Ivan Vanko is a Russian ex-con who managed to build his own twisted version of the Iron Man suit. His nickname comes from a pair of deadly whips which are powered by the suit's glowing chest piece.
Director Jon Favreau has been hinting at the similarity between the technology used in Iron Man's armor and Whiplash's:

"The technologies are definitely related, and that’s part of the core theme of the film"
Jon Favreau
Here's a new picture showing Whiplash in his full glory:
(Click on a picture to enlarge it.)

Whiplash won't be the only enemy in the movie Iron Man 2: Tony Stark will also compete with Stark Industries' rival Justin Hammer (played by Sam Rockwell). Besides he will have to cope with his new superhero status...
:)