Iron Maiden

Entertainment Weekly says that Scarlett Johansson is rumored to be taking over for Emily Blunt on Iron Man 2,

Johansson would take on the role of Russian super spy Natasha Romanoff, aka Black Widow.

Blunt's contractual obligation to "Gulliver's Travels " may proclude her from co-starring in the superhero sequel.

The story states that Johansson has met with the filmmakers and is interested in taking the role, but it depends on Blunt's schedule because her agents are trying to fit both films into her
schedule.

Heck even Eliza Dushku announced that she was interested in the part of Widow...

I am a fan of both Dushku's and Scarlett But I hope Blunt can work it out