Some People in the official Corsair Forum and on Reddit found out that the Corsair RGB Line-Up does only support 512 colors instead of the advertised 16.8 million colors. At this point it is nothing confirmed it just does not seem to be working and some user are claiming that the it is a Hardware problem because the Panasonic chip, that does the lighting effects, does not support 16.8 million Colors for each Key. The last respond from Corsair is nearly one week old and it just says that their "engineers in Asia were out of the office due to a holiday" and there is none official respond from Corsair if this issue will be fixed or not.
Source (Corsair Forum): http://forum.corsair.com/forums/showthread.php?t=133172
Source (Reddit): http://www.reddit.com/r/MechanicalKeyboards/comments/2jhe9h/corsair_rgb_keyboards_only_capable_of_512_colours/