This makes me think if Apple has a hitten agenda here. Bringing out the iPad Mini with a less then perfect LCD, and then next year coming out with mini2 to sell the same device basically twice. The LCD technology is there now, but they purposely have choose not to use it.
It would definitely add a nice marking plus into a device that otherwise can't have too many new hardware feature by definition as the technology is pretty mature now.
I think it's more that they chose not to wait until they were able to do it. I believe that for the moment they just can't pack a retina into that chassis. They will, eventually, but they couldn't afford to wait any longer and let Amazon, Google and Samsung eat the whole small tablets market.
So they chose to bring out a great tablet with a "normal" display. They chose size and weight over display. Which is, IMO, a better choice than the other one, because they're alone there. Would they have made a bigger (or smaller display) and heavier tablet, it would have been "just another meh tablet" and a bigger "WTF Apple" than it is.
Besides, they gave themselves a lot of room for improvement. Now, theyt gave the same room to their competitors. Which leads me to actually believe the retina Mini will come soon enough. One year, one and a half maybe ?
That's probably what the iPad Mini message to the competitors is: look what's going to fall upon you sooner or later. Now try to beat us to it ;-)