Reps from both Marvel Studios and the actress herself denied the initial story. Although it seems that Marvel is in fact searching for another female actress to be a part of The Avengers lineup. Currently, Scarlett Johansson is the only female cast member signed on, and the site reports that Marvel is trying to add another woman to the cast.
The mysterious female role wasn't revealed, although it is speculated that The Wasp may be the character being added to The Avengers on-screen team.
The Avengers will start shooting in February, with production taking place in New Mexico, Michigan and New York.