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I'm all for having many different dragons, but I'll reiterate that they've been removed from the races and will be made into bosses. I can't imagine having bosses for each dragon color from the previous games: maybe 10. A maximum of 1-2 ;).
Edited: OFF-TOPIC in the message
Each person perceives colors differently, but the main colors are those that are obtained through a prism (raindrops, other reflective surfaces). Perhaps different peoples recognize different main colors, but there are still only 7 main ones. Derivatives can be found in the link from Aziral. By the way, Irdiss Evalle, are you learning Japanese?