I just actually finished reading about the Cooper S US Spec. Not sure how official this is but the colors mentioned were white silver metallic, midnight black, british racing green II, thunder grey, deep blue and pepper white.
Blazing red metallic was carried over from the countryman and paceman model.
Volcanic orange and Ice chocolate metallic are new colors added for the new line up.
It's either the british racing green II or the midnight black metallic for me.