If a 56-page discussion thread on the Apple Support forums is any indication, there appears to be a problem with some MacBook Pros with Retina displays. The Retina displays with the issues show image retention and burn-in; others do not.
TUAW reader Joe K. sent us a note about the issue, which appears to be happening to MBPs with displays manufactured by LG; other displays made by Samsung don't have the problem with image retention and burn-in, are brighter, and seem to display colors with more accuracy.
To determine the make of the Retina display installed in your MacBook Pro, Joe supplied a helpful terminal command:
ioreg -lw0 | grep \"EDID\" | sed "/[^<]*</s///" | xxd -p -r | strings