We would be interested in supporting this as well in Ubuntu Budgie.
From the above the only bits that we think we need to worry about are
- the gnome-shell changes that need to be added to budgie i.e. gnome-software and gnome-control-center are part of our desktop.
- the PAM module - is this specific to GDM3? UB using lightdm.
So as more info becomes available please can you share what changes gnome-shell are making to support malcontent?