attila77, your list of bullets is way too long since it includes repetitions but, most important, it is not related to the naming since both MeeGo and MeeGo-Harmattan will offer you the same choices within the Qt family.

Web Runtime? Plain Qt? Quick? OpenGL ES? Your choice independently of MeeGo, MeeGo-Harmattan or even Symbian. Still not happy and willing to go for MeeGo Touch Framework? Fine for MeeGo and MeeGo-Harmattan.

If you keep yourself in the official API most probably all your headache will be to compile and package separately for MeeGo and MeeGo-Harmattan. But anyway, even within MeeGo rpm you might need to compile native apps more than once to target x86 or different ARM chipsets. All this can be a quite automated process, though.

More than the names, developers will care about the relation between extra work, potential userbase and/or profits. Which is a calculation they are used to do.