Additionally, it appears the yellowing comes and goes with device usage, indicating it is probably a heat reaction of the adhesives used in laminating the screen together. If this is the case, expect more and more yellow-screen problems to creep up as people use their new iPhones over the next few weeks.
Interestingly, this isn't the first time Apple's had problems with yellow screens; it was previously reported with iMacs and 3G models of iPhones.
Ping!
Another potential problem that I have heard about is that the antenna is around the outside edge of the phone and your fingers can interfere with the signal and cause disconnections.
wow the v4 iPhone looks to have some issues with launch. I’m sure they’ll fix it by v5 (I think).