When Microsoft acquired the Nokia mobile division it bought the rights to the Lumia name, but not to Nokia, which lives on a separate company. In that sense, the notion that Microsoft eventually phases out Nokia branding from its products is of little surprise since they have to do it.
A new report from the site Geeks on Gadgets claim that this transition period takes effect as soon as the Lumia 730 and Lumia 830 hit the shelves. In other words, those will be the last Lumia devices with the Nokia name emblazoned on them. Considering Microsoft is not suspected of any new Lumias until 2015 – possibly with 'Threshold' – the effect will not be felt for some time.