New versioning scheme in gtkmm? In glibmm?

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

Gtk+ has announced a new versioning scheme:
https://blog.gtk.org/2016/09/01/versioning-and-long-term-stability-promise-in-gtk

I suppose that it will affect gtkmm. Will gtkmm use the same versioning scheme? If so, I suppose that once a gtkmm-3-22 branch has been created in the git repository, we shall start removing all deprecated API in the master branch. And fix bug reports that require an ABI and/or API break. Am I right?

Will glib use a similar versioning scheme? I.e. soon an ABI/API-breaking glib 2.90 release and then glib 3.0?

Kjell