>not to forget the rumored Nokia's Qt for next billion either.
I have yet to hear even the slightest hint that Meltemi, the project to which you refer, will be open-sourced.
> Wayland compositors that can be based on Qt Compositor framework can manage similar level of performance as the custom mcompositor, and Qt Components (https://qt.gitorious.org/qt-components) is continued to be developed.
True, qt-lighthouse and qml-scenegraph look great, but having great components is different from having a great UI like Harmattan. Harmattan isn't really even running on MeeGo, but on Maemo 6. That's why it uses the deprecated Touch Framework.
The situation is such a mess and the public code remains incomplete, so I think that no one will touch it.