That said, Apple does tend to keep their designs for a fair while, so it's possible there will be one next year, or that it will become the new SE at some point.
>>rekoil+(OP)
You won't get one, unfortunately, both because there's no motivation for Apple to make it, and because battery life would be an insurmountable issue, at least with current tech. The battery life in the Mini is already significantly inferior to the other iPhones in the line; Apple's only going to be willing to push that so far before it's an obviously-compromised product and they would just refuse to ship it.