Sounds like "shipped" means "manufactured" now, not necessarily "built and sent out the back door?" I'm no shipping expert, but it seems unlikely the last lot of 4 million Wiis are still en route to retail some 25 days after December 31.
Regardless, Nintendo continued by saying that the company is "well on its way" to reach its global target of shipping 2 million more units by March 31. In contrast, the report reminds us that Sony only shipped half the total number of Wiis (2 million) through mid-January, two weeks behind schedule. In case you were wondering, that above shot of Reggie was taken shortly after the announcement.