Wii.com has a great interview with the designers of the new Nintendo WiiFit interviewed by the president of Nintendo himself.

Hello, everyone. My name is Satoru Iwata, President of Nintendo Co., Ltd. As you may already know, some time ago I began conducting a series of interviews explaining the vision behind Wii. Now I’d like to continue that process to help explain the thinking and planning behind our new product, Wii Fit.

link: the interview