Okay, aside from stealing the thunder from competiton's possible announcement of their wii-too-motes, the only way this thing could be effective in changing the market would involve Nintendo giving them away to existing wiimote users, with a few possible conditions for exception.
There's also the problem of this working with existing peripherals such as WiiWhell from Mario Kart or other peripherals.
As so many have put it before when discussing about additional peripherals for rival consoles, there's a question of adaption rate of a peripheral.
So, the exception that rule would be one, this peripheral is somewhat obtainable to existing Wii-owners at a relative cheap price, if not outright free. An exception to that is if the the peripheral is simply there to accommodate to the speed of the motion, aka. patching the lag time of the wiimote.
Two, the addon capabilities of this will be optional, or in that it will simply become an optional/additional control schemes separate from the normal wiimote movement. This could lead to low-adaption of this new peripheral in games, though, except with those games that people want to see 1:1, maybe a Light saber game.
I am sure there are more, so please feel free to add your thoughts.
In the end, I eagerly await Nintendo's E3 conference before putting my final thoughts on this whole thing.
I am a PC gamer, and also have a NDS now, but without access to a Nintendo Wii until End of 2007.
Currently playing: Super Smash Brothers Brawl(Wii), Mystery Dungeon: Shiren the Wanderer(DS), Dragon Quest Heroes: Rocket Slime (DS), WiiFit(Wii)
Games Recently Beaten: Final Fantasy Crystal Chronicles: My Life as a King (Normal; Very Hard after the next DLCs become available)
1 word: RTFA