Sorry I am a bit late to the party here. My personal life has been so busy, I have scarcely had time to sit down at the computer for more than a moment at a time for some weeks now.
The live environment on the newest ISO (230701) looks like KDE?! I thought I had the wrong ISO somehow, but then I figured maybe it is a temporary workaround since so many folks mentioned Calamares isn't working.
There is a lengthy "KDE Plasma" splash screen while booting, with a black background and a big KDE logo in the middle. After the splash screen, there are no panels, toolbars, icons, or anything except the Calamares window--but I did notice a couple KDE shortcuts (Alt+F2 launches krunner, Meta+T opens tiling menu) are working! 
Calamares itself came up fine and ran with no issues. The panels at the end look great by the way! 
The installation came up fine, I've just started poking around.
There is a missing environment variable, which is why Btrfs Assistant is not launching (I thought that was in this thread somewhere, but maybe it was in the other one).QT_QPA_PLATFORM=WAYLAND has to be set somewhere. On Sway, I usually launch Sway itself in a wrapper script that sets my environment variables, but I'm not sure the method for incorporating that into SDDM.
How are you guys setting environment variables for the session so far?
You can export from the command line and it will run:
export QT_QPA_PLATFORM=wayland
btrfs-assistant-launcher
Bonus (especially for SGS 
): you can run Btrfs Assistant in dark mode by adding export QT_STYLE_OVERRIDE=kvantum-dark to /usr/bin/btrfs-assistant:
sudo micro /usr/bin/btrfs-assistant
Scroll all the way down and add the line just before the call to btrfs-assistant-bin:
#!/usr/bin/env bash
#
# This wrapper allows allows some enviroment variables to be set properly even when it isn't in the envir
#
ID=$(id -u)
if [[ "$ID" == "0" ]]; then
export XDG_RUNTIME_DIR=$(mktemp -d)
fi
# extract the value of --xdg-desktop if it is passed and put all other args in params
for i in "$@"; do
case $i in
-x=*|--xdg-desktop=*)
export XDG_CURRENT_DESKTOP="${i#*=}"
shift
;;
-r=*|--xdg-runtime=*)
export XDG_RUNTIME_DIR="${i#*=}"
shift
;;
-t=*|--platformtheme=*)
export QT_QPA_PLATFORMTHEME="${i#*=}"
shift
;;
-p=*|--platform=*)
export QT_QPA_PLATFORM="${i#*=}"
shift
;;
-d=*|--display=*)
export WAYLAND_DISPLAY="${i#*=}"
shift
;;
*)
params="${params} ${i}"
shift
;;
esac
done
export QT_STYLE_OVERRIDE=kvantum-dark
btrfs-assistant-bin ${params}
I haven't had the installation up very long, but my first impression is it looks really good! I realize I missed out on a lot of the nitty gritty since you guys have been hacking on this thing for a few weeks already. 
The wallpaper changing on its own took me by surprise--I thought a lock screen had kicked in but it wasn't working!
, btw two things
, did we need also garuda-inxi?
