I really don't see them replacing MeeGo (or Symbian) with WP7. Seriously, there's absolutely nothing but a name and snappy UI. No multitasking, other features missing, localization only half way done... no, it's completely different product for different type of device. It cannot be integrated to Nokia's ecosystem, so either there is some very deep going cooperation between Nokia and MS (which could also mean end to Nokia-Intel cooperation, I think is unlikely) or all of this is just empty talks and fancy dreams of some idiot analyst.