Not directly related to the LG UI, but this would affect it.
Has anyone heard if the setting to use a dark theme in the Marshmallow UI survived in to the official release? It was in one of the preview releases, and it's something to which I would be looking most forward.
I only saw it written about and didn't get to see it in person, so I'm not even sure how inclusive the setting would be, but it's long overdue generally speaking.
Note that I'm not talking about the currently available toggles to invert colors, etc. Preview 6.0 had a setting that switched you to a dark theme without screwing up photo colors or your wallpaper (for example). As in the Android Central app and many others.