It has not been updated yet. It was not part of the SONAR or Artist Instrument Collection installers. Those are the only parts shipping in CbB at this time.

I think the theme editor was great and shws just hw much work and detail there is in this GUI. But it was 97% there, and that other 3% was a pain to creating a new theme.
colours not changing
colours not given an option to change.
colour settings affecting affecting unrelated options.
 
I hope they get a chance to respond to the feedback before re-releasing the theme editor.