KGI Securities analyst Ming-Chi Kuo, who has offered accurate information on Apple's upcoming product plans numerous times, has issued a new research note claiming that the iPhone 5S will be available in a gold casing in addition to Apple's traditional white and black options. There will also be an option for larger 128 GB storage.We also forecast the new model will add a new look, a golden casing, and a new option for larger 128GB storage, to offer greater differentiation from iPhone 5.The possibility of a gold or champagne colored iPhone 5S option has been raised a few times in recent months, but Kuo is the most credible source yet to indicate that the iPhone 5S will indeed be ava