If Zelda doesn't get another rep this game I'm going to be supremely disappointed. We haven't had one in 10 years. (Kirby hasn't, either). If the music theory is true, the only possibility is an Impa echo of Sheik.
However, Zelda is one of the very few franchises to have had a song never posted to the website-- because it was already up the day the website launched. Maybe that means we're definitely not getting a unique newcomer, but maybe the songs will "wrap around"? We have many weeks to go and some franchises, like Final Fantasy, are definitely not getting any new tracks to be posted. Maybe they will run out of franchises, and since Zelda was the first series, it will be first in line for a second music track? Really unlikely, but just a thought.
Of course, the music theory is just a trend, but it seems pretty consistent so far. The worst part is that it would deconfirm Bandanna Waddle Dee and Geno too... (from the base game, at least)