Due to time constraints and previous planned films it seems that Scarlett Johansson will not be in Iron Man 3. She did hint that a Black Widow film wouldn't be out of the question but for now it seems she is hanging up the tight leather. Link.
Personally I don't care. Sure she is pretty to look at but I'd rather have characters that made sense within a storyline than tits and ass being shoved in my face. And a Black Widow film isn't something I'd be to keen on either. Johansson said in an interview she would like a Bourne-type of film for BW.
Will the absence of some T&A be something you miss in Iron Man 3?