2010's Iron Man 2
The Black Widow is a S.H.I.E.L.D. Agent who went undercover as Tony Stark's assistant so she could keep an eye on him, eventually revealing her true identity and beating up several guards in a memorable scene that led to talk of a Black Widow spin-off movie.
Whedon said last year that Johansson would be the only "female avenger," which he will likely address somehow in his script. In the comics, Black Widow falls for Hawkeye (Renner), though whether Whedon will include that is unknown. Also, for those concerned, Johansson is a redhead again.
Very little since she was revealed in the line-up for The Avengers at last year's Comic-Con. But that could be because the actress has been involved in a divorce from actor Ryan Reynolds, which grabbed a lot of attention from tabloids and has seemingly shied Johansson from talking to the press.
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