Yep, most people prefer the Dark and that’s been the default for a long time but I still see fairly regularly screen shots from users with light mode so some people prefer it.
Cantabile will come with Dark and Light like it always has. But… you can build your own (as simple as tweaking the colors in a text file, or as complex as redesigning the whole theme with new graphics if you’re keen).
Also, you’ll be able to share your custom themes just like happens with the current Cantabile release (eg: see here).