The retailer that the preliminary Japanese data is based on is now showing Wii Fit at ~50,000 units (assuming the same extrapolation methodology for games sold during the week can be applied to preorders), as of November 22nd Japanese time.  Wii Fit releases December 1st in Japan, which means preorders should rise significantly by the time the game releases.

I believe Super Mario Galaxy preorders at this retailer peaked at ~150,000 (extrapolated) the day before the game release, and sales were in the 250,000 range.  Interestingly, Super Mario Galaxy did not reach the preorder top twenty until about the same time Wii Fit did (i.e. 1.5 weeks before release), so it will be worth watching to see how high preorders for Wii Fit get.

In other news, Dragon Quest IV had a pretty impressive debut based on it's highest preoders (but I'm, not going to ruin it for you)...We'll see what the first day data shows! 

Depending on the interest in this thread, I may reveal some of the other preordered games in the top twenty...

Do you get any data on the DS TV attachment?

John Lucas should start preparing himself for the crow he'll be eating.

Interesting.
Prediction WiiFit - 500K for the week or Nintendo sells out.

Agreed - sorry John, but 1m is way out of the ballpark on this one. It should have incredible (forever) legs though - like WiiSports in Japan.

Do we have any sources/rumors on how many WiiFit units Nintendo has created for the launch?

Man..what does it take to be a hit in Japan? I hope WiiFit doesn't bomb.

A DSlite

Pure speculation on my part (i.e. not based on anything but my opinion), but I'd say Wii Fit will move roughly what Super Mario Galaxy did in week one.  However, I think it will decline incredibly slowly (if supply is there).  Galaxy went from 286k-45k in the prelim data, and 255k-75k, 250-80k by Famitsu/MC and VGC in weeks one and two. 

Wii Fit I can see doing like...200k...160k....130k...100k....70k...55k....

In contrast to Galaxy which will end up more like: 250-80-40-30-30-60-60-75-50-20-20-10-10