ASUS Response: We've received a response from ASUS that they're unable to replicate the problem on production units (I/O units are, technically, pre-production), so this may have been sorted out in time for the initial consumer run. It appears, then, that this problem is at least affecting only some units.

Update: Here are some more comparison photos from a different Nexus 7.

wm_IMAG0132 wm_IMAG0133

wm_IMAG0134 wm_IMAG0136

wm_IMAG0138 wm_IMAG0139

wm_IMAG0141 wm_IMAG0142

Some have suggested this is a native behavior with IPS displays called "image retention."
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