Jeremey Renner was talking with MTV Splash and spilled a little about his role as Hawkeye in The Avengers and his costume, and relationships:

“I think it’s going to be a little more reality-based. You can kind of tell with Scarlett [Johansson]’s character [in ‘Iron Man 2’], it’s going to be more of a uniform . . . and not a big purple, comics sort of thing. That’s why I think it’s more palatable to audiences – there’s almost a sense of reality to these superheroes. That’s what makes it interesting to me, anyway.”
He also says Black Widow and Hawkeye have a “relationship [that] is still to be discovered”, which could really mean anything from they’re lovers to they share one thirty-second scene together.

Has Renner SEEN what the comic book version of Widow wears? Yeah Scarlett didn’t wear the skin tight spandex catsuit that widow does in the books, but the form fitting black outfit and flowing red locks made her look the part rather well.

I don’t expect to see the spandex version of Hawkeye’s costume in The Avengers, but I don’t doubt for a second that he will be wearing purple, even if it is a darker purple, just to tie the new look of the character in with the theme. And I do like that they are not jumping right into the relationship between Hawkeye and Widow just yet. That way after The Avengers is done, they can do a Hawkeye spinoff film and Widow can be in that.