The leaked renders of the new color options for the Samsung Galaxy S III mini include Titan Gray, Garnet Red and Onyx Black. Those are in addition to the original Marble White. The Samsung Galaxy S III mini is not coming to the U.S. which Samsung promised to Apple in return for the latter agreeing to remove the device from its patent suit that will go to trial next year. Samsung argued that the phone was not available in the U.S. and should be removed from Apple's suit. Apple, in turn, pointed out that it was able to get multiple orders of the phone shipped to a U.S. address by Amazon.
The leaked renders did not come with any clue as to when we might see these new colors available for buyers, although previous reports mentioned that the new colors would be available no later than the current first quarter of 2013.
source: SamMobile via AndroidCentral