A price drop wouldn't surprise me any. With Sony coming out with the PS3 Slim and Microsoft dropping the price of the 360 for the 100th time, it would only be smart for Nintendo to do something along the same lines.
Right now you can pick a Wii up from Wal-Mart at 199 bucks, a very affordable price if you ask me. I wouldn't be shocked if they just released a black Wii with no price drop. Nintendo has to make money and I don't think selling your system at 150 or 100 dollars a pop would be the best way to go about it.