There are more yellow and less yellow displays, on all models, every year. Someone with a more yellow 12 walks into the store and happens to see less yellow 13 displays, then comes here and reports "yay, the 13 series is improved". Someone with a less yellow 12 orders a 13 and happens to receive a more yellow one, and report "dammit, the 13 is even more yellow than the 12". Those are all just anecdata. So far there is nothing whatsoever in this thread that would indicate that there is any substantial change this year.