It was the most asked question from the people during the Dem debates Sunday night, but for some reason was not asked, possibly because the people with the actual answer weren't on the stage.
The first person who would be asked would be FBI director James B. Comey whose office is conducting the investigation. He would probably be able to answer the question but his position on the governmental food chain at #3 precludes him actually answering.
Attorney General Loretta Lynch is the person with the official responsibility to give the go-ahead on prosecutions based on evidence submitted from the FBI but her position at #2 on the food chain means no action without permission from the top. Without this permission, she will probably announce that the just-us department is carefully studying all the evidence and will make a decision when the study is complete. Unsaid but understood is the date on this which would likely be January of 2024.
#1 on the food chain, El Presidente will diplomatically waffle publicly stating that Mrs Lynch is working on the evidence and he doesn't want to influence her decision.
It now looks like while the Clintons don't own the cops, they do own the judges so I'd have to guess that no, Hill will not be prosecuted and will probably get a presidential pardon in January of 2017.