Will the iPhone 5C see a refresh?

I don't own an iPhone, but I like the work that Apple does. And theres something special about the 5C and its plastic casing. So, this being said, what do you think will happen to the 5C? Will it slowly roll down production until we're just left with metal iPhones? Or perhaps Apple will take the internals from the 5S, put them in the 5C? Because as of right now, the iPhone(s) that Apple will announce in the fall will be the upper tiered models, with the 5S squarely falling into their midrange territory. Either way, it will be interesting to see what happens.