Heat Vision says:
Marvel is conducting screen tests Friday for one of the final roles still looking to be cast in The Avengers, the all-star superhero ensemble being directed by Joss Whedon. Last night Samuel L. Jackson revealed on Jimmy Kimmel Live it is that of his "sidekick."
V star Morena Baccarin is on that list. Also said to be vying for the part are Jessica Lucas, Cobie Smulders and Mary Elizabeth Winstead, who are still negotiating their test deals for the part of a key member of the espionage agency run by Nick Fury, played in the Marvel movies by Jackson. Some earlier speculation pegged the role to be that of Avengers team member Janet van Dyne/the Wasp, but Marvel declined to comment.