I read the article, but you and they are missing the point. Why should some company reinvent the wheel from the beginning if they have already released 5 versions of such kind of system?

What else should Meltemi be if not a Harmattan, Fremantle, Diablo successor?

No mather if they call it "for low end", "for hi end", "for toasters with touchscreen" - Qt will be the development tool of choice, I'm sure they will stick to QML like Harmattan and now look: In the N9 is a 1GHz single core CPU.
There are already some S40 devices out there with a powerful CPU - not the same core but very similar.

Harmattan is currently very snappy, and will 1 GHz single core in 2 years resist in a hi-end or a lo-end device?

It's clearly the Harmattan successor. MeeGo is only a name as maemo was. Perhaps they will add support for a T9 keypad on top - but the core system will stay nearly the same.

If you ask me I would put this system in a device with state of the art hardware. But if you look at Nokia as it is in the moment you can buy this system soon in a 50€ plasic phone with 3,5" touchscreen, 5MP camera and 8GB storage.