The iPad2 and iPhone4 also suffered from this, and apparently it isn't a defect at all - it's simply a bonding agent in the layers of the LCD panel that gives everything the dull yellowish tint. After a few days of normal use, the bonding agent cures or evaporates (or whatever it does) and the dull yellow tint is completely gone.
Give it a few days of display-on usage and report back.
+1 - this is what I was thinking.