Given the simple fact that the guitar hero controller utilizes the wireless technology and accelerometer or the wiimote by connecting to the nuncuck port, that shows that many more 'smart' accessories will be coming out.
That means, a zapper that has relocated buttons built on to it, or an endless amount of options!
My point being, an accessory can be much more than a plastic bracket - if it connects to the nunchuk port. I think the guitar is the only accessory at this point in time to take advantage of this...
Any thoughts on what may come out int he future? The possibilities are endless...