I agree, that fan trailer is really well made! Is that song really the same Otome Sensou song only instrumental? I watched the MV for the full song, it doesn't sound much like it. But the music used in the trailers matches Sailor Moon in a different approach IMO. Gives it a more mystical and fantasy/action quality compared to old BSSM music which felt more shoujo. It's amazing what you can do with software nowadays compared to a few years ago.