VERY odd indeed. I can't see something like that doing very well, at least not over here in the West. But I guess one will never know until it happens.
Am I interested, no I am not lol. Something I can sit on that vibrates and whatnot...just no. I can't imagine a good game with that option.
I do really like Wii's normal motion controls though - I think Nintendo did a really good job with that. And when programmers utilize this technology well a game can be really fun. Metriod 3, Zelda, Mario Galaxy, even Ghostbusters comes to mind.
Nintendo has done an excellent job in marketing their hardware to all kinds of age groups here...but as a result, I think the hardcore gamer is left wanting with the Wii.
IMHO Nintendo needs to focus on new, quality games for hardcore gamers...like it used to be in the old SNES days.