Not sure I agree with their continued use of GNOME, though; seems the land of the Linux desktop has abandoned GNOME's years of user-hostile actions and moved to either KDE or to increasingly more obscure build-a-desktop stuff (ie, sway + waybar, or river, or bspwm, or w/e).
Some major distros already do KDE by default, and basically phone in their GNOME support by virtue of "GNOME claims it 'just works', so let it 'just work' and hang themselves on that claim".
But yeah, having a Debian-based atomic image distro seems to be very interesting. Would be more useful in enterprise than in the user desktop, but I guess they can do that in the future.