Apple might have eradicated any hope of the white iPhone 4 when they took their store down today. According to Cult of Mac and Apple rumours, all mention of the white iPhone has been wiped, and all the images that used to have the white iPhone in it have been switched to black.
At this point, with it being April and a June release of iPhone 5 being likely, it doesn’t make sense to introduce a new colour with just two months of play time. [Apple Rumors via Cult of Mac]