I am a professional photographer/videographer, so I am used to staring at photos and displays most the day. I am also used to the new Samsung displays as I also have a Galaxy S2 phone. Thought I would throw in my 2 cents. First off, taking photos and posting them online in an attempt to show anything about a display in front of you is pointless. Everything from the white balance setting in the camera you are using, to how its picking up the available light or reacting to the flash all come into play. Not to mention the monitors everyone is viewing them all will be calibrated differently and see the photo a bit differently.
Having said that, I for sure notice a difference from my iPad 2 and my new iPad. The photos of mine I have uploaded and websites with lots of photos just to name a few. Without getting too technical, what people are seeing as a "yellow tint" is a boost in the saturation on the new iPad. Apple did this on purpose, Google "iPad 3 boosted/increased saturation". So yes, its going to make whites look a bit on the warm side but it also makes colors pop, or very vibrant. Samsung has been doing this with their displays. When I look at the same photos or photo websites on my Galaxy S2 (made by Samsung) and an iPhone 4S, the iPhone always looks washed out and a bit dull, the colors don't pop like they do on my S2. Apple has apparently noticed it too and decided to change it. I, as well as plenty of other photographers and graphics people I know agree its for the better and snagged the new iPad. So yes, when you are looking at a pure white page with some text on the new iPad, its going to have a slight tint to it. If it looks straight up YELLOW, you have a bad display and should probably exchange it.
Everyone sees colors differently and some prefer a warmer, saturated tone while others prefer a cooler, more contrasty one. You are not going to please everyone. I think it would be great if Apple included the ability to change the contrast, saturation and sharpness on the iPad or better yet, a way to calibrate it. Maybe there is a good app I don't know about? At any rate, I really like the new display, best one yet.