I just got back from the Apple store where I was comparing my iPad 2 to the new one. I'll have to upload a quick picture I snapped with my iPhone later but the display on the new one was noticeably warmer in color temperature than mine when comparing a web page. Basically, the white looked much whiter on my iPad 2. I would say it was more drastic a difference than even the resolution. Both devices were set to max brightness.
I think I noticed this in the past when comparing newer iPhones to older ones. Do the displays always take time "cool off?"
Anyway, I'm waiting till next gen to upgrade anyway because I wanted an HD FaceTime camera, not a better a rear camera.
Oh, walked out with an Apple TV.