Here is a list of some of the issues I've seen come up with the latest iPad being released. If there are any that I missed or we should check for feel free to chime in. So far so good for me it's passed all the tests. 
-no dead pixels < check
-no backlight bleed < check
-no yellow tint < check
-no scratches, scuffs, lint or dust under screen < check
-flush home button < check
-no abnormal heating up < check
-no dead pixels < check
-no backlight bleed < check
-no yellow tint < check
-no scratches, scuffs, lint or dust under screen < check
-flush home button < check
-no abnormal heating up < check