According to Macotakara Apple has begun using a new painting process developed by a small Japanese company to finally produce the white iPhone 4 reliably enough to ship this spring.
Their source claims previous attempts to mass produce the white iPhone 4 resulted in so many defective units it was cost prohibitive for Apple to actually ship them. This new process lets them better control the thickness of the paint making it more reliable. It's supposedly the difference between Apple abandoning the white iPhone entirely and finally shipping it this year (perhaps as soon as February 27).
So the question is, do you believe it's actually coming or will you only believe it when you see it?