Compared to my iPad 2, my new iPad Air definitely has a green(ish) hue, specially on skin tones. I took mine back to Apple store today for that issue and for slow WiFi performance. The replacement one they gave me also has these two issues. The Genius Bar acknowledged the inaccurate color hues, but had no answers as to why the display isn't color accurate. They also had no idea as to why the internet connection is so slow, even on their wireless network.
I also brought my iPad 2 to the store with me to demonstrate how Speedtest performs on both units, and they were also stumped by the results. What's funny though is that they acted as if they never heard of Speedtest, and kept trying to discount its validity since it's a third party app. When I challenged them to use any speed testing app they want to compare both models, they quickly backed off from slamming Speedtest. My iPad 2 is literally TEN times faster than the new Air over WiFi, and FIVE times faster on cellular network than my new Air. To top it all, my new Air is not connecting to AT&T LTE, only to AT&T's 4G. My iPhone 5s is connected to LTE just fine. I contacted AT&
I ended up buying a new AirPort Extreme with 802.11ac to see if that cures the wifi slow speeds. There's obviously something seriously wrong with the new iPad Airs in my opinion. I am an avid Apple consumer for many years now, and have put up with new product rollout glitches, but this is by far my worst experience with an Apple product purchase/usage!