Between the issues that people are having with yellowish screens, bad WiFi, and overheating, I think that they are scrambling to just figure out what's going on and how to fix it. It has only been a week since the released it. There must be some bad components out there that got into these things, because I can't imagine that they would release it with flaws this large, and because numerous people seem to be having no problems at all.
I don't have the heating issue, though it does get warm where my wife's iPad2 stays cool. I just have the yellowish screen on the left side, darker screen on the bottom, and flaky wifi. I am sure that all of these issues will be worked out, probably in later production runs, once they figure it all out. I'm sure that they're taking some of the ones that are returned for problems and examining them to figure out what is going on and how to fix it.
I'm glad that I got my iPad at Target, because I can wait for 45 days before exchanging it. Having a flawed one to use while I wait is better than going back to the crappy resolution of my original iPad. 🙂