The posterity is that its been mentioned in the release announcement. (flagged in unstable a while ago … so technically its been in Testing Announcements, etc too) Every release since 28 days ago.
Also, if you are using xorg-xinit, make sure that you copy everything from /etc/X11/xinit/xinitrc into your ~/.xinitrc (and replace everything from twm & with your own stuff). If you don't to this, systemd will not get $DISPLAY, leading to xdg-desktop-portals failing to work, also causing long startup times.