Yes, they are the miniature colors from GDW. I believe there are some Warhammer 40k colors in there as well.
TBH, I love looking at the thumbnails of the painted miniatures, its amazing how well they are finished.
It seems most of the colors are in game, would be cool if they released more colors. I don't see the difficulty in it to be honest.
1 thing that would be cool, I know there are UI tools to write your own custom addons, what about a new tool to customize armor?
Also, what about a new guild reward "Guild Colors", where the primary and secondary colors are set for the guild, and it you choose, you can use the guild colors or your own primary colors you picked?