There where some news about WM+Nokia generated by USA media some time ago(yes i know this is from Times Online).

Honestly there's under 1% change of this happening. Nokia's whole high end and mid end is paved for Qt and so for Harmattan/MeeGo and Symbian^4. WM would make no sense at all.
Nokia makes it's own phones. Foxconn have made Nokia branded CDMA phones and example from 2,100 Nokia's Finland factory workers 100 are working for Foxconn and branding some of the phones for carriers.

Eldar Murtazin actually said in his writing that there's no plans of WM7 phones for Nokia and i believe him there.