Nintendo have stated that the Wii has been produced at roughly 700k/month so far. The reason they will have 6mill by March, is that they spent an extra month (or more) before launch producing units. They aim to have production up to around 1mill / month by April/May (or later in the year). I think if people are expecting 1.25mill / month for the next FY, this is a little overly ambitious (15mill units).
Gesta Non Verba
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Wii code: 2263 4706 2910 1099