Rethought things, all the problems raised are completely on topic. Removed that useless comment from posts #1 and #14.

There's still one problem, even if we port h-d to gtk3. Apps.

As of today Debian lacks decent mobile apps. We have many of them, but many of them'll use libhildon+gtk2/qt4.

And if what we create is source-code incompatible with the old Maemo apps... we're screwed.

Besides - the Qt Components. But I'd see this as a second priority.