I will wait for the retina iPad mini, and compare to the redesigned iPad 5 (assuming it is). I think what I love about the mini is the weight, the fact that it is more portable, and the look (black and slate is so damn sexy).
Time will tell. I thought about buying the mini now, then passing on to my daughter when I am able to upgrade to retina mini. But the iPad 3 serves me well enough and I love retina.