According to the official Hori US website, their classic arcade fighting pad will be heading to North American shores compatible exclusively for the Nintendo Wii. This device will be released in November 2007 for $49.99. Below are tidbits of information you’ll probably want to know before purchasing this remote control:

• This product does not have the Classic Controller’s L or R Stick fitted. Also the L button and R button do not function with the analog output.
• This product connects to the Wii controller as a “Wii remote expansion” and does not function when directly connected to the Wii.
• This product is compatible with Classic Controller compatible games. Games that are Classic Controller compatible have the compatible mark on the back of the packaging.

Source: Hori (USA)