Someone else touched on this, but they are copying what they did with NES. First it came out with two controllers and Super Mario Bros. Then, they kept it at the same price or like $20 more and added the gun and duckhunt, they version I got when I was 10.
Wii will be the same I bet, It will be $269 or so and have Wii Sports and Link's Crossbow game w/ the zapper. This way current owners aren't being screwed because the zapper by itself w/ link's crossbow game is $20, so it's all the same.
I doubt any color option yet. They are having too much trouble just keeping up with demand in white. Though a black model would be nice. I would have gotten that.
EDIT: Also could be some pack w/ Wii Sports and Wii Fit and Balance Board. Though that would be like $299.