Saw Wiis in 2 stores today, something I've not seen since the day before last Thanksgiving (when they were stocking up for Black Friday).
There were at least 2 at the local WM, and possibly dozens in our TRU, which has been consistently selling out their Wii's every other Sunday well into 2008. The TRU had signs in the window advertising this shipment, so clearly they expected it to be big.
Of course these are just 2 blips, possibly coincidental. More data are needed.