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> DEs were themselves busy switching to Qt.

Interesting. I know only of KDE. Are there others? (Genuine question)

LXDE - the ultra light weight DE - is switching from GTK+ to Qt. I think Canonical is switching Unity from GTK+ to Qt as well.

Unity 8 uses QML for the shell itself but the applications will still be in GTK. And Lubuntu pushed back shipping LXQT until at least 15.04.

"Unity 8 uses QML for the shell itself but the applications will still be in GTK."

I think GTK will be just for legacy/3rd party applications and new stuff by Canonical will be Qt based.

According to develop.ubuntu.com, Ubuntu SDK allows two types of apps. Native (QML) and HTML5. I don't see GTK+ written anywhere.