If I had to make a prediction, it would be that the new iPad mini will have a Retina screen and internals based on the fourth-generation full-sized iPad, all in a device imperceptibly thicker and heavier than the current model. Maybe that's wishful thinking.
If Apple does break the Retina barrier on the iPad mini, I hope it keeps an upgraded non-Retina model around for a lower price. As I've seen in the last year, the non-Retina iPad mini is still an excellent device. It just needs to be faster than an iPad 2. I'm pretty confident that Apple will make that happen, Retina or no.
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