The next build and up will default to the dark color theme in the editor.
HTML-Kit has always opened with a light color theme and HTML-Kit 292 didn't even come with a dark color option, so this is a noticeable change.
The dark colorizer theme will be the default for new installs, and for upgrades that have never changed theme settings. If you're upgrading, and if you've previously changed the color theme, you won't see any change.
In all cases, you'll of course be able to switch to your preferred style with this menu:
Let me know if you have any issues with this or the dark theme in general.