Perhaps this is posted elsewhere but I can't find it.

Patch 2.3 came with only 1 Cenarion Mount color. It's the same as the taxi color (Blue with some Orange)

You show 5 different colors, and all other 4 are better looking than the Blue & Orange, in my opinion.
http://www.mmo-champion.com/images/n...arionmount.jpg

Where did you get the other colors? (Data mining the patch?)
Do you know if or how they might be implemented?