Iron Man the game is now live on Xbox Marketplace.  It comes in at 643.34 MB and you will be playing as Iron Man.

"Based on the blockbuster movie by Marvel Studios, Iron Man blasts onto the all major gaming platforms! Immerse yourself in hardcore shooting action and explosive combat from the film as well as exclusive content created just for the game. Customize your Iron Man suit and battle against armies of fighter jets, tanks, armored Super Villains and more. You are a One Man Army. You are Iron Man. Download the demo."