mine is bluish . no yellow screen. however, people should know that this is not a defect and its screen calibration color. if you jailbreak the iphone when its available. purchase a tweak called color profile. it will make your screen bluish as much as you want. if your only issue is yellow. then do not worry about it at all.
Love color profiles!
my 128gig is a nice screen already without it, but it'll be nice fine tuning.
My rMini and 5 benefit quite a bit from temperature tweaking and bold effect