They’ve revealed the Bonus Features on the 2nd disc, no deleted scenes to be included much to the dismay of many who were wishing for an fanedited extended edition

The Skywalker Legacy: The story lives forever in this feature-length documentary that charts the making of Star Wars: The Rise of Skywalker.
Pasaana Pursuit: Creating the Speeder Chase – Dive into the making of the movie’s epic landspeeder chase and discover how this spectacular sequence was brought to the screen.
Aliens in the Desert: See what it took to create the Pasaana desert scenes, from the sheer scale and complexity of the shoot to its colorful details.
D-O: Key to the Past: Explore the ship that connects Rey to the mystery of her missing parents and get to know the galaxy’s newest, irresistible droid.
Warwick & Son: Warwick Davis, who played Wicket in Star Wars: Return of the Jedi, dons the Ewok costume once more; this time joined by his son Harrison.
Cast of Creatures: The team behind the film’s memorable creatures reveal the puppetry, makeup, prosthetics and digital magic that bring them to life!
Digital Exclusive: The Maestro’s Finale: Composer John Williams reflects on his body of work for the Star Wars saga and shares insights on scoring Star Wars: The Rise of Skywalker.

I enjoy that they’ve included a lengthy doco about the making of the film, hopefully in the same vein as the very in-depth The Director and the Force from TLJ instead of a fluffy PR piece like TFA, but that remains to be seen