You're partially correct. They only officially released ONE clip pre-release and that was the "The Party is Over" clip on October 25, 2013. The first clip of any songs from the movie (Let It Go sequence) was released December 6, 2013 and Demi Lovato's Let It Go was released November 1, 2013.
Frozen had its last trailer premiere October 18, about a month before its release. That trailer was called the "Elsa Trailer" and is the only one that featured music from the movie (which was The First Time In Forever, so not even that movie's breakout musical number). We could see a final trailer at the end of October but that's still far from a guarantee. The first Frozen and Moana had the pop versions of their main music numbers released at the beginning of November. I wonder if this will be the case with Frozen II. I guess we'll have to wait and see!
New trailer drops Monday, September 23! Will probably be shown in front of Abominable and will 100% be shown in front of Maleficent 2.
663 people are talking about this
https://www.google.com/amp/s/screenrant.com/frozen-2-new-trailer-monday-confirmed/amp/