That's honestly something really underwhelming in terms of hype for this game, music.
For Brawl it was one of the biggest features for updates and hype. Like Sakurai really really really went out of his way to hype up the music for Brawl. Nothing feels like it's going to be surprising in that department, no newsposts of "So I was talking with Koji Kondo with how I was going to have this stage and all these songs from this series, and he said 'you know what, I'll do a special rendition just for this!' and you can post it on your website *laughs*" that I'm sure were pretty common during the brawl days (I can't recall what songs Sakurai ended up 'releasing' during daily posts, but IIRC the Ocarina of Time Waltz, FD's main theme, etc etc, were all given dedicated posts).
Could so easily give us so many hype PotD's with music.
I feel like the negative responses Sakurai had from Brawl really jaded him in so many ways, the whole exclusion of a story mode (something he poured extensive resources into, no matter how lame it was) and no "celebration of Nintendo" spark that Brawl had by really going in depth with the tiny particularities of things in the game in terms of visuals, audio and "feel". All PotD's are basically "reveals", but it just hasn't been the same weaving of a story.