If you really like the smaller size but like the retina display, then the right answer is wait a cycle and get tne next mini (either happily because it gets the retina, or grudgingly because it improves in other ways but doesn't get the retina display and you would have been happy enough with what's on order later tonight).
That's assuming the thing sells big this time out, and that Apple means to keep the streak going by improving the display in the future.
Hah but there's no way I could delay my own mini purchase to the next cycle, I admit that. I'm pre-ordering tonight even though I figure a refresh is probably in its near future. I'll skip that refresh but might end up somewhat annoyed over having done this buy tonight, depending on what else they tack into the next mini. I don't care that much about the retina display on that size, though.
Well... good luck with whatever you decide! 🙂