It looks as though Johansson will not be Iron Man 3 which then means, no Black Widow.
In an interview she had with Screen Rant, she all but confirms that her character Black Widow won't be in Shane Black's Iron Man 3.
Though the cast of the next addition to the Tony Stark saga is filling up rather quickly with a bevy of notable and formidably talented actors, Scarlett Johansson’s Black Widow will not be joining the adventures on this one. The actress told us she would not be appearing in Iron Man 3 at the start of our interview with her and The Hulk himself, Mark Ruffalo, at The Avengers Los Angeles press event last week. Johansson did, however, pitch the idea of a Jason Bourne-esque super hero movie featuring the Black Widow character.
If she isn't in Iron Man 3, it won't be the end of the world. I think with all the recent casting news of Ben Kingsley, Andy Lau, Jessica Chastain and Guy Pearce being in Iron Man 3, I think they can manage not having the Black Widow.
What do you think?
Source: Beyond Hollywood