I received my second replacement much earlier than 11th April. I was kind of skeptical initially before I unboxed the iPad having many bad experiences with apple panels in general. I can say I am lucky this time when I discovered that the screen is firstly UNIFORM. Of course I did not see shades or blotches of pink, cyan, green or grey on the screen. As to the screen temperature or color temperature, it came to me as slightly yellow initially when I unboxed it. It was warmer than my so called iPhone 4s "reference" screen which was actually bright white. The so called yellow white somehow disappeared after a day or two of use. I did not do a burn in. I don't think it is a matter of getting used to the color temperature. It is not bright white which I think spoils the panel's ability to represent the colors in a more natural and with better contrast. The colors are deeper and not white washed because of the intensity of the screen bright white. This cannot be adjusted by the brightness level of the screen. It is how the panel is built and calibrated at the factories at Korea or elsewhere. Funny is that I managed to change my iPhone 4s just yesterday due to my static issue and now my "reference" panel has deeper greens and yellow which i love. It is not like my previous iPhone 4s that was bright white. I was short changed all these 4 months :(
Anyway, my friend emailed me a post edited photo with deep greens from his oled panel phone. His screen was beautiful with very saturated greens, reds, and yellow. When I compared it with his, my new iPad was quite close to his reference photo while my phone 4s was still a tad not as close. Anyway, I was much happier now, firstly with my uniform screen new iPad that has a good color temparature that shows colors pretty well but not as well as the oled panels. Also my iPhone is now better with a panel that is not too bright anymore with better colors. It really helps in reading since my eyes don't tire easily with such bright white color temparature. And the contrast is better for reading.
I guess in future when oled screens (which actually has a almost the same or better than retina resolution) is used for apple panels, apple fan boys like me will be happier and not have panel problems so frequently. I am now keeping my new iPad and iPhone with much care cause it is not easy to come by a screen that I like.