It looks like America might get their own retro-styled GBA SP soon.
According to Game Informer Online, Nintendo just might be planning to release a new Game Boy Advance SP system designed to look like the original 8-bit Nintendo Entertainment System. The system will probably be released this summer, in a move similar to the Japanese launch of the Famicom styled Game Boy Advance SP. The inner part of this NES GBA SP will be designed to look like the original NES controller.
Along side the release of the system a series of old NES games will be released for Game Boy Advance. Much like their Japanese counterparts, these games will most likely come in cartridges colored like NES games and boxes that are reminiscent of the old school Nintendo game boxes. Which games will be released has yet to be decided, but the Famicom mini games released in Japan are up for consideration.
Although Nintendo has not yet officially announced this system yet, when contacted about it they did mention that it "is being considered."