AppleCare just informed me, after my 5th swap that "capture is closed" for this issue and that he would need to set up a repair. I told him that was unacceptable and that all I'm requesting is a replacement after the issue is fixed.
Perhaps they are getting closer to figuring out what the real problem is?
I suspect we will never see a complete fix on this generation at least a high probability nothing will be done. Why do I say this? I've seen this before.
The first generation iPhone. A good portion of the units after the first few weeks had this "negative black," issue. It wasn't 100 percent of the units as I actually ended up with a good one, but I went through about four replacements or refurb models that had the "negative black." The second generation iPhone was much better in this regard and of course today iPhone 4 screen is fabulous (knock on wood that doesn't change).
Second, I've wanted a new iMac since the 16x9 models came out. I've had a couple 27 inchers, 1 21.5 incher, and seen a couple other in normal lighted homes. Each one had the yellow screens on the right and bottom portions particularly. They are still like this today. Some of the 24 & 27 cinema displays have this problem too. Apple says nothing but that they use some of the best displays available.
Therefore, I am not hopeful of iPad 2 getting 100 percent remedy. However, some of us will enjoy it as it is without much worry. Others might want to wait until the next generation. iPad Original isn't so inferior after all and can be had cheap.
Nevertheless, we know Apple has many amazing products. The notebooks are fantastic with great displays, terrific iPhone 4s and iPod Touches, etc. They make extraordinary products.
Some of us simply know the products so well, that when something is a bit off like this, we notice it. We also have a forum of thousands who help us spot such issues. Many won't notice it. Some will though, and there is nothing wrong with pointing it out.
Each person has to decide, if they even notice it, what the best solution is for them. Enjoy it as is, or wait for iPad 3.
Nevertheless, this thread is great in continuing to update us all, on if there ever is a significant change in the production and how the displays look.