Among the early adopters for the latest iPad mini (now with Retina display), there have been a few reports of "screen burn in."
Essentially, this means that the screen will temporarily retain faint outlines of strong graphical elements even after you move on. In all honesty, the effect is very subtle and probably would not be noticed unless you were on the lookout for it (or had read about it online).
That being said, if you want to test your new iPad mini, here's a link to Marco Arment's image retention test. Interestingly enough, my excellent MacBook Pro 15" with Retina Display retained the squares for a good 20 seconds after I ran the test on my computer. Just saying...
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