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watchOS 2.0 adds many new colors including variations of the previous colors and even new tones: light orange, turquoise, light blue, midnight blue, lavender, vintage rose, walnut, stone, and antique white.
A previous beta version of watchOS 2 already added a multicolor option for the modular watch face. watchOS 2 also changes how complications like activity and sunrise/sunset appear, adding new color elements on watch faces including utility. watchOS 2 GM was released to developers today and will be available on September 16th alongside iOS 9 a week from today.