The theme editor will come before the next official theme from Cakewalk. Its already pretty far ahead in development. We already fixed a few things in Tungsten in
Update 1 of 2016.05 that we released today, and the 06 update will have several more tweaks to improve theming support and to the Tungsten theme itself.
As you might imagine, adding dynamic theming support to SONAR was a pretty big project that required a lot of work on the UI besides the graphics design work on the actual Tungsten theme.
We have most bases covered between the light and dark theme, so we are interested in seeing what graphics inclined users come up with once the theme editor is released. If there is enough interest we can even build a community to share themes.