Nine times out of ten they probably won't. It would be great if they did, but I don't think they're headed that way with her storyline. Since she was given it at a young age while at the Black Widow Ops program she would have displayed signs of it by now but she seems merely human. Though it is entirely possible for the Whedons to manipulate the timeline a bit for it. It'd be pretty awesome for Clint and Natasha both to have their own individual movies instead of just being accessories to everyone else's. Plus it'd be educational for the non-comic reading fans who are still drawing blanks about their pasts.