I really don't think we'll get another origin story. I think he'll show up, already-established but still in high school, in Civil War, then the 2017 standalone movie will take place after that. They might do an opening credits montage in the 2017 movie, a la Incredible Hulk 2008, but I can't see them going any farther than that on Parker's origin story.

Frankly, I wouldn't be surprised if we get Parker for Civil War and Spidey 2017, then Parker dies at the end of the standalone movie and Miles Morales is the going Spidey from that point on.