I think that's unlikely. It's too much backstory for one movie that has a bunch of other stuff going on. Cap will more likely just go on fighting without the shield and get himself a new one at a later date. They could make a whole Captain America movie based on what you were just talking about, I suppose, but it's too much for an Avengers flick.
Also, I'd say Storm is Marvel's premier black superhero.
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I love Pepper, but a huge portion of that is Gwyneth Paltrow. I'd be sad to see her get killed off.
I do kind of wonder if they'll have Stark and Romanov ever get together in the Cinematic universe, since that was totally a thing in the Ultimates.