Ian: He makes it fairly obvious he is talking about the shell. He mentions attachments, and then goes out and for the first time describes the mystery shell. Saying it is very similar to a wavebird, but also moddifed.
Also how he talked about the shell, its completed, and I have no doubt that developers already know about it, and how to us it. At least, I think that is implied...but that jerk did interupt him, so he didn't finish that thought.
Now, I also believe we will be seeing other attachments from Nintendo. Miyamoto seemed very excited about all the possibilities attachments opened up.
He also mentioned Western design and games specifically talking about FPS...a genre that isn't popular in Japan. It makes me think Nintendo isn't just aiming for the Japanese market, but also the American.