A little back story as I've gotten two iPad Airs that don't do this, and none of my other LCD devices do this.
I ordered 4 128 gig LTE mini retinas for the fam and opened them up. The first two I noticed ghosting on from the home screen icons after about 2 minutes and the other two were fine. But the other two had this horrible backlight issue all along the bottoms of the devices that at startup with the Apple logo it looked like a flashlight was coming up from the bottom (backlight bleed).
The devices were swapped by mail and a week later all 4 did the Image retention issue out of the box. Some with the backlight issue in addition to the IR. In contacting Apple, I was informed this was standard behavior of the devices and I've seen the notation on their site stating as such. Yet I've had the genius bar leads say it isn't normal, I've had colleages with retina Macbook pro's had their screens replaced for this issue, and posed the question what do graphic professionals do when they are editing work on their screen and they move windows around and see this ghost imaging. The answer is they couldn't do this kind of work as photography and video editing require static images to be on screen and I've never seen LCD panels behave this way with such freqency. So when I'm told this is rare and or acceptable by Apple and this is followed up by that's not normal, it is irritating. I also know this issue to become worse over time, and Apple also told me it goes away over time. Another contradiction.
So I'll pose a different question. How many have recieved devices that don't do this retention issue? The min is much better than the origional Mini with the resolution increase, I'm sure the lower speaker volume can be fixed in a software update as I would assume they are using the same speakers as the origional mini, and I've seen two iPad mini retinas that didn't do this image retention. But they are seemingly more rare than I've been lead to believe by Apple and online research.
Can anyone else recommend a solution?