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I just now remembered that the Castle of Dreams' regular background music is Bibbity-Bobbity-Boo, and trying to imagine a "dark" version of that song kinda has me breaking into fits of laughter.
I'm hoping for a new theme entirely. Though I wouldn't mind parts of Castle of Dreams' battle theme getting mixed into a new battle theme.
"Black Powder" is a catchy battle theme, but it simply can't hold a candle to the epicness that is Fate of the Unknown and that it was never even once used in BBS itself (or the whole series for that matter) was quite a waste for such a great piece.
Not to resurrect a topic, but...
Terra's theme is a slowed down version of Fate of the Unknown. It was used, just not in the way that we expected it. However I agree that it should be used in the full splendor of it's original rendition.
Silent Forest was always a favorite of mine from BBS, a rearranged version would be great.