Apple officially announces the availability of the elusive White iPhone 4 on Thursday April 28th, 2011. It took roughly 10 months after iPhone 4 initial release.
June 23rd, 2010
Apple announced the first delay to White iPhone 4 which was pushed back to the second half of July 2010.
July 23rd, 2010
White iPhone 4 release was pushed back again to late 2010.
January 11, 2011
Apple removed references to White iPhone 4 from its website.
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According to person who really familiars with the matter and is not Phil Schiller, White iPhone 4 will give Apple about 6-month buffer till the next generation iPhone is release. In addition to that White iPhone 4 includes minor design change from its original and CDMA counterparts.