But Reggie Fils-Aime says we may see more special edition 3DS bundles!
The reason North American markets haven't seen more 3DS colors is due to the "nuts and bolts of how [North American retailers] manage [their] SKUs at retail," according to Nintendo of America President Reggie Fils-Aime in an interview with IGN.
According to Fils-Aime, Japanese retail differs from North American retail because all the hardware is kept "behind the counter," as opposed to in North America where "it's all out there on the shelf." This means that if he were "to have 25 different SKUs out there, Wal-Mart would kill [him]."
While this may mean that we're always going to see less color options in the North American market, Reggie gave a glimmer hope when he said that the special edition hardware bundles they've been selling recently (e.g. Fire Emblem, Animal Crossing) allow Nintendo to have a "range of different SKUs," but in small quantities that sell quickly.
This means they could release several special edition 3DS systems while maintaining a relatively small number of concurrent SKUs.