“Once Upon a Snowman” premieres on Disney+ on October 23, 2020.
Based on the press release, it does not appear that the short contains a new song for Olaf.
The film follows Olaf’s first steps as he comes to life and searches for his identity in the snowy mountains outside Arendelle.
Director Trent Correy supposedly first had the idea of exploring what happened to Olaf before he met Anna and Kristof way back on the first Frozen film.