Speculations of course, but as far as I can see, Elop has only said no more MeeGo, be it "native" MeeGo or some politically correct branded Maemo (MeeGo 1.2 Harmattan). He has also stated that the UI on the N9, Swipe, will be seen on future devices. Then, the "next billion" is S40 with web-apps. So the question is, what kind of devices will we see Swipe on in the future? It is highly unlikely that it will be S40 or WP. This leaves only Symbian and Maemo. IMO we will see it on both. The focus right now is on WP, but WP is high end, Nokia need mid and low end smartphones as well.